I _think_ this was sarcasm, but...

Not as far as I know. Full-size SUVs used to be classed as trucks and (were?) exempt from many safety tests and standards. They used to have the worst safety ratings, actually, despite mass. Modern engineering and production with multi-material crash zones also means the mass is not necessary.

Plus, smaller cars don't kill everyone involved in the accident outside of your car.

People are just like "my car is bigger than yours", aka super-size me.

Survivability in crashes requires mass. It's a race to the bottom (top) unless we figure out how to head it off with better regulation.