My reasoning is that Elvis Costello's Dad Is 'The Secret Lemonade Drinker' is as grandiose in his delusions, and thinks he'll be 'rewarded': exactly like Dr. Olivia Pierce in "DOOM IV". Oh, and he thinks he can put up a 'fight'. Certainly in his 'dream' that he can somehow bend Reality to his will.
Reality is the Doom Marine that Dr. Pierce feared so much, and with the upgraded Rocket Launcher, Gauss Cannon & BFG 9000 that is Facts, it's given him an Argent Plasma-based lobotomy.
One can see why the adults at Bethesda Softworks bought id Software - if this is what id Tech 6 can do - eh, Ellie...?!
Oh, and a question: if 'Videogames are for kids' as you maintain, why does "DOOM IV" have a PEGI/BBFC rating of '18': for adults only?
I refer you to the above scene after the Doom Marine has given said Spider Mastermind - formerly Dr. Olivia Pierce, as per that linked final stage* on YouTube - a lobotomy with his BFG 9000. My, but that's something you see in every episode of "My Little Pony: Friendship is Magic", amirite?! And that had the death of an evil character: King Sombra. [/Doug Piranha-levels of sarcasm]
*- I question that particular uploader's reliance upon the Super Shotgun, though: didn't he have the Gauss Cannon...?!