You're joking, right?

I was trained overseas and while all of our training was initially done with single pilot flying in mind (because a Seneca is not a multi-crew airplane) it was done with the intention that everyone in the program would be working for an airline.

Crew incapacitation is one of the major tenets of the airline training over there and is covered from day one. I have never seen it addressed in the US.

Not everything done in the US is the best or only way of doing something. Our training over there was not exclusively Multi-Crew training, but the MCC (Multi-Crew Concept) was a big deal. CRM is much deeper than just "Don't be a jerk", which is how it is addressed here.