It has nothing to do with "fun" the average Hardcore Gamer is suicidal.
These people either just want to die or already dying of a terminal illness or they realize they are just going to die anyways and decide to go out on their own terms.
The average Hardcore Gamer will kill themselves as soon as police arrive to avoid capture. Because they want to die, not serve 100 years in prison.
actually true
the overwhelming majority of shooters do it because they hate certain people and they want to take them out before they go out themselves
that or they know the loving media will go nuts and paint them as some forgeted-up idol for other potential shooters, and everyone wants to be famous
the plan from the start is nearly always to take your life either when you're done or when the cops arrive