If you’re third party, it’s currently a 2 party system but your end game is ranked choice voting, so throw your vote at the non-Republican who has the highest chance. After all, they use third party candidates such as RFK to siphon votes so you can only guess how strongly they’d oppose any system that disallows them from using that to their advantage. A vote for Republicans is a vote to never ever have third party candidates have any chance in any presidential election, just a strategic tool to help Republicans win