What background do I need to have in order to be allowed to recognize that the mathematics of lesser evils don’t make any sense?
A mathematically illiterate one.
See, we live under a system of First Past the Post, otherwise known as Plurality.
It's a system that forces a two party system. Not as a conscious choice, but as a consequence of the very system itself.
Here's the kicker. Plurality voting actively punishes you for supporting a third party.
If you siphon votes away from the lesser of two evils, the greater evil wins.
It's a pretty simple concept. And since we are just weeks away from the election, anyone who is actively pushing for third parties is automatically suspect.
Because the problems with Plurality are not some newly discovered quirk. They've been studied for centuries, but most extensively by Kenneth Arrow in the 70s.
What I'm saying is that most of the money given to support Third Parties, comes from people who are on the opposite side of the spectrum from those Third Parties.
Simply put, Trump and company throw money at the Greens and Socialists to siphon support away from the Dems, so that Trump and company can win with fewer votes.
So you, advocating for a third party, are mathematically indistinguishable from a Trump supporter.