Earlier quoted context omitted.
Whenever something like this happens, people like to dismiss the situation by saying we can't possibly understand "crazy" people. It avoids having to consider the systemic reasons why something like this can happen. I'd imagine a significant part of it is that we live a society where some people can have their livelihood yanked away from them, with no support structure to help them, leaving them desperate and angry.
Absolutely it makes sense. "That person shoot out random youtube employees therefore youtube should change its helpdesk" argument does not make sense. It makes as much sense as caving to any other form of terrorism. Youtube and its employees are the victim here. Using this to put pressure on them in the "for the safety of your employees" way is incredibly distasteful.
No. The employees are the victim. Youtube? Not at all, save for a day of missed work. Them cutting off a person off their income without any way of appeal caused the whole chain of events in the first place.