That's a weak argument. "We know their policies, vote them into office so they can enact those policies, but they're ineffectual so you can't claim we actually support those policies." That's the type of logic you see in satire.
I honestly don't think it's the politicians who are the radicals in the Republican Party; it really is the voters. Obviously not *all* of the voters, but a sizable amount. Politicians follow the votes and try to piece together a coalition of voters that will get them elected. For YEARS (since the Reagen administration) Republicans have given racists, homophobes, and bigots a wink and a nod to get their vote, while still trying to maintain a semblance of decency. This courtship escalated under the Bush administration and has now become a major cornerstone of the party under Trump. The current batch of Republican politicians is beholden to these people, even if they disagree with them.
Again, I'm not going to sit here and say that every Republican is a homophobe, but they are at the very least okay with electing homophobes to represent them. You have to ask yourself if you really want to vote for politicians who are in bed with these types of people. Lay down with dogs, you're going to get up with fleas.