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“”A fanatic is someone who can't change his mind and won't change the subject."
|—Sir Winston Churchill|
Monomania is the obsession with one topic or idea to the exclusion of all others.
It is quite possible for a monomaniac to become quite pathologically defensive of their views and to use logical fallacies in argument, before descending to ad hominem attacks. There is also often an inability to recognise that others might not attach the same importance to the points they think they are making.
Any subject at all can be espoused by a monomaniac, but they often stand out when supporting a minority concept against the rational or overwhelming majority opinion, e.g. Creationism and other fundamentalist religious views. Extreme political stances are also often espoused by monomaniacs.
Some monomaniacs are obsessed by a subject in which the populace in general has little or no interest and it is a moot point deciding when a hobby or interest becomes monomania.