https://slatestarcodex.com/2019/07/08/gay-rites-are-civil-ri...
First you show the world you exist and convince your friends it's worth trying to change things, then you convince the moderates, then you win the fight, then you wait for your bitter enemies to die because they'll never be convinced but at least their kids are open to new ideas.
Pissing off your bitter enemies can be hard to avoid and still get the job done.