It seems to be a common strategy for people seeking civil rights to pathologize their activity or preferences as a way to garner sympathy, but, as Brave Lucky Game points out, this doesn’t really make any sense logically.
The same influence also has some effect on the fat rights scene—sure, mostly by concern trolls, and not so much with the “fat rights scene” (it’s largely rejected by, well, everyone). The script goes pretty much the same way: “It’s so horrible to live a life that’s so fat and disgusting because of that fat and disgusting body. Haven’t they suffered enough? I mean, being fat is worse than anything!”
In a slightly different way, pathologizing children is used to “fight for their interests,” too. Look at how inferior they are! Look at how ignorant and illogical they must be to not know everything about civilization! Clearly, their brains just don’t work right, and that’s why they’re pure and innocent. And let’s not forget that many cultures assume that being a teenager is essentially an unfortunate temporary mental illness.
And to another point, it’s something that pisses me off a lot in the “pro-choice” community. Nobody ever wants an abortion; it is a horrible, bad, wrong thing that we’d absolutely do away with if we could figure out a way to stop women from whining about their rights. Because, really, come the fuck on—it goes beyond adoption, beyond financial and emotional means, beyond every ridiculous fucking excuse out there: sometimes, you just don’t want your genes to go on. Sure, 99.999% of everyone with a uterus would prefer “not getting pregnant in the first place” to having an abortion. But pathologizing abortion—and the choice to have one—is just more support for the concept that abortion is a horrible, shameful thing, no matter who you are.