What's the harm
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“”Those kind friends who suggest to a person suffering from a tedious complaint, that he "Had better try Homoeopathy," are apt to enforce their suggestion by adding, that "at any rate it can do no harm." This may or may not be true as regards the individual. But it always does very great harm to the community to encourage ignorance, error, or deception in a profession which deals with the life and health of our fellow-creatures.
|—Oliver Wendell Holmes, Sr., Homeopathy and Its Kindred Delusions|
What's the harm is the name of an all too common emotional appeal argument employed by cranks and woo peddlers (particularly alternative medicine and New Age woomeisters) used to defend the usage of their particular bullshit. The line of reasoning is that because there is nothing inherently harmful with something, that it should be tried. While not inherently fallacious, when used by woo peddlers and their advocates it's often a poor escape hatch argument.
It is commonly used after the rest of their BS claims have been thoroughly refuted.
The basic argument
[Insert woo/crank idea here] hasn't caused any harm. Therefore, [Insert woo/crank idea here] should be tried.
While it's not ALWAYS necessarily a bad line of reasoning, there are plenty of activities that are inherently safe and enjoyable (listening to music, trying a new sport, painting, etc), when used by woo peddlers it's a means to defend their practices. Unfortunately for them, there actually ARE inherent harms associated with their practices.
Waste of resources
You are essentially losing time and money on something that is ineffective, as opposed to spending said resources on an actual solution. This benefits no one but the crank who tricked you, who will happily take your cash and run (or stick around for more, if you're of a mind).
No one benefits from ignorance, and in many cases it can be downright dangerous. Spreading misinformation to desperate people who actually need a cure is both dangerous and unethical, as you may very well be endangering their lives.
Deprives an individual of an actual cure/solution
This is where the real harm comes into play: people trying unconventional solutions often avoid actual solutions to their problem. For example, when Suzanne Somers had a breast tumor removed, her doctors recommended she undergo chemotherapy as a precaution, in case there were metastatic cancer cells they missed. She refused, because she was taking fermented mistletoe extract "instead". Luckily, she remained cancer-free, but it could have gone the other way.
Telling a cancer patient to try (say) cannabis oils, as opposed to evidence based medicine, and attempting to defend the practice with 'what's the harm' is evil and fallacious, as you actually are endangering another human being at that point. Even if they are using woo treatments in tandem with legitimate medicine, you are still wasting resources, as per point #1.
Criminal justice cases
Especially in high-profile crime cases, when suspects are taken in early, published as the likely offender, and end up receiving disproportional focus from the media, people sometimes ask "Well, what's the harm?". If they were somehow linked to the crime or were in the exact area at the time (and especially if they seem really shady), don't they almost deserve to have their faces plastered in the news and their role in the entire mess focused on?
The problem with this reasoning is simple. When investigators and the general public get stuck on a suspect that is a product of an early investigation, and who actually turns out to be less and less likely to really be the culprit (or lone culprit) as time moves on, the actual offender is left with far less heat. While it may be comforting to watch the news and see numerous suspects lined up right away, and while it may be a PR victory for the police to be able to "demonstrate" to the public that they're on top of things, the fact remains that less time and energy gets devoted to finding the real offender when the bandwagon takes over.
And the sentencing of an innocent man does more than just that. It also stops the police from looking. They caught the guy, right? The result of which is that, even for every trial that turns out to be caught up with the wrong person, a guilty man walks unbothered in the streets, and aside from perhaps never having justice served to him as a result of the delay and confusion, possibly giving him time to strike again. This is why sentencing the wrong person is not just ruining the life of an innocent person; on top of that, it's essentially like giving a pardon to the real criminal.
“”Look at how much African American communities are suffering from Democratic control. To those I say the following: What do you have to lose by trying something new like Trump? What do you have to lose? You live in your poverty, your schools are no good. You have no jobs. Fifty-eight percent of your youth is unemployed. What the hell do you have to lose?
- What's The Harm? catalog by Tim Farley
- Orac points this out to an acupuncturist
- Couldn't have said it better myself
- The problem with Trump’s question to black voters, ‘What the hell do you have to lose?’ by Max Ehrenfreund (August 24, 2016) The Washington Post.