Yep it's the classic "first they came for" dilemma. Your dad is probably a straight white guy with a decent job cruising to retirement. That's great for him and his family. No need to do anything to push back on the trends now while it's easy because it's not affecting him.
It's definitely been awful for a whole lot of people though. Immigrants and brown Americans are getting ICE'd (the detention centers are worse than most people want to know 🙈). Trans people are being harassed and pushed out of society, they can't even renew their passport without having their gender forcibly changed or feel safe going to the bathroom.
There are real things that folks like him could do to show the GOP that they need to pull back, but the truth is they are going to wait until they come for them, once it is too late.