I can think of one counterargument to your list of people arguing for/against things they have a stake in... Homosexuality. It's such a common thing for peopl

I can think of one counterargument to your list of people arguing for/against things they have a stake in... Homosexuality. It's such a common thing for people that are extremely vocal against homosexuality to end up being found having a same-sex affair, that I start to assume anybody who is extremely homophobic is actually just a deeply-closeted gay.