Are humans doing anything to endanger the giant pandas?

All normal rules apply here, Pandas that are accustomed to human contact would interact probably fairly well, but typically the panda is quite a lazy mammal. Being an ominvore that exclusively feeds on bamboo, this gives an advantage to human interation over other family members such as the polar bear.

What you have to remember is that a panda that has had no human contact ever would probably act the same way as any animal that is scared/unsure of the situation and flight or fight would ensue - but as I said previously they are quite lazy and this would be hard to say for sure.

This probably doesnt help you that much, but the panda is endangered and most have probably come into human contact at some point.