Thank you for this comment, I had a hard time pinpointing exactly what made me feel uneasy about all those answers justifying the audience behavior or explaining that they were setup for violence because various harmful objects were present.

It is indeed the same way of thinking.

If you murder someone, I don't see how you could blame them for being too close to a knife or gun. Having the opportunity to do something does not systematically justify doing it.

edit: this logic does not apply even if the person brought the harmful object with them, the decision to do the harm is ultimately not made by the victim.