Earlier quoted context omitted.
You are getting really hung up on a very tiny edge case. No reasonable manager would punish you for being physically overpowered. That doesn't mean you should encourage people to ignore the security policy. 99.99% of the time, saying to the tailgater "you need to swipe" is enough. If you do work somewhere where people are physically trying to break in often, then you ought to have real security personnel.
It's not about being punished for being physically overpowered - it's about being a five foot 3 intern and having someone 6'1 250 lbs, in a suit and in a hurry, behind you, tailgating. The implications are enough to make it a shitty situation for such a person have to turn around and say "sorry person that looks c-suite, you can't come in with me."
It’s also a safety issue. In a building evacuation, you should be able to account for every employee or visitor.