I think many wrestlers didnt even think about internal damage really, they probably just thought that it will hurt but the pain will go away, you get a headache? so what it will go in time, its pretty ridiculous looking back, it makes for a good visual but to think how much he struggled for the sake of a chair shot that most people wont even remember.
its like smashing a computer with a hammer then wondering why it wont boot up properly. Some of these guys even saw it as badge of honor to work with a concussion, as Ive said before really, its the silver lining of the benoit incidents resulting investigation / research, at least more people are aware of the damage this stuff can do.