what is the best way to get politicians who aren’t genocidal

I can tell you with great certainty that voting for genocidal politicians is the worst way of getting politicians who aren't genocidal.

My advice, as always, is to organize, protest, and elect, with a greater emphasis on organizing and protesting.

1. Get as involved as you can with activist efforts locally.
2. Organize, network, focus on building solidarity. Join or form a union. Join the IWW.
3. Vote at primaries and elections for the best candidate, even if you doubt they can win.
4. Don't punch down.
5. Don't punch left.
6. Educate yourself, politically.
7. Push for voting reform and for anything that breaks the two-party system.