Health: Well, if they think there’s nothing wrong with toeivah and the Torah is wrong to prohibit it, then I’d see what you’re saying. But if it’s only a political opinion, it’s not that important.
Anyway, who knows why they hold it — maybe they think the best way to mekarev secular Jews is to pick our battles and only fight for Torah to be translated into policy when it would help us with kiruv? The fact that there are frum Jews who approve of toeivah marriage may be confusing but perhaps it’s a great kindness from Hashem. If such people didn’t exist, many secular Jews would never consider making teshuvah! That’s how strong the hold of liberalism is on some Jews — and with liberals in general, they are absolutely closed to any argument against toeivah marriage. And many people stay very liberal after becoming BTs.
I’m not saying we shouldn’t try to influence people to have what we consider a more correct political opinion on some matter, if we think we can do so without transgressing (by looking down on others, hating them in our hearts, getting angry, saying something hurtful, bearing a grudge, etc.). I occasionally argue about politics even here.
But I don’t see why people get so worked up about it — it really makes no practical difference what a single person’s political opinions are. What matters is each individual’s Torah and mitzvos and middos and maasim tovim. Anyway, if I couldn’t stand it when people disagreed with me, then I’d hate everybody and never vote for anybody (since I agree with Republicans on Israel, toeivah and euthanasia, with Libertarians on foreign policy, and with progressive Democrats on most everything else.)