1. This is not a mainstream political belief. The law at the root of the current issue in Texas is far beyond the mainstream. The intention at some level is to shift the Overton window of what is mainstream in its favor, but that has not occurred yet.
2. It's not my responsibility to educate this guy to my point of view. I don't know him and I don't work with him. Actually the only thing I know about him is that he doesn't respect the rights of others that I feel are important, so I'm doubly disinclined to make his acquaintance. I would presume that some amount of discourse did occur within Tripwire, but I don't think we know.
3. I'm allowed to vote with my dollars. It doesn't have to be a glorious public crusade, and it may not make the slightest bit of difference. In this case, it certainly won't. But those dollars work for me, and I can choose to deploy them so as not to (tacitly or actively) support people or business who wish to harm myself and people who I identify with. That's what I have chosen to do, and others should make their own choices.
4. In a different scenario, I might indeed feel differently. I don't find that the slippery slope is a solid argument for why I can't take (lawful) action to preserve my values though.