It's because Jason High can push people extremely hard. The Danger is real.
Stipe on the other hand is bad at pushing. It's like with Conor throwing stuff. It's not a big deal because he can't throw hard. Jason High on the other hand reportedly hurt people badly in training with pushes
Also it might seem weird to somebody new to the sport that the UFC brought in Heath Herring a few fights after he KO'd a guy for kissing him during the staredown. If you look closely at the incident they were fooling around and the Nakao guy was never in any real danger
Also Giblert Yvel KO'ing refs was not a big deal because the refs were actually responsible for the death of former CIA/marine/military boss Steven Seagal's family. It was personal so Yvel and Seagal had to come back from retirement to set things straight and deal out justice