The place to defeat RINOs is in the Primary.
However, in any election you very rarely if ever get to vote for your ideal candidate. You instead must choose among the choices that are available.
We do need to convince more people that voting for a bad incumbent is better than voting for a better challenger in the primary because they feel the incumbent has a better chance simply because they are the incumbent is a bad idea.
However, we also need to have some better challengers. More often or not we are left with picking the least horrible of the candidates.
I'm not at all happy with this situation, so if you have a rational solution to this dilemma, please share it.
However, in any election you very rarely if ever get to vote for your ideal candidate.