What on earth are you talking about? You literally made up the 1.5 vs 3 degrees thing above, and now you're basing your argument on that being true, despite you having made it up moments ago.

Do you have a single source that says "Americans think climate change is only half as bad because of F vs C"?

Personally I doubt that a meaningful percent of Americans (or people anywhere) even know this "3" number to begin with, let alone the unit. This isn't something most people are focused on.

It changes nothing. My whole point was that people aren't deciding on who to vote for based on sound scientific principles. You aren't going to change their position with more facts or new facts.