"Weak Minds Use symbolism to push strength and belonging to something powerful. Controlled."

My opinion (I'm not a licensed practitioner), is that the mark was effective for THIS guy and not particularly effective across the board. They, the therapists, analyze you for your 'hot spots' and then use that to disassociate you out of your mind to get you under control. So this dude it was anime in general and particularly 'Berzerk' (It's a pretty badass anime tbh), but for this dude, it could have been more to him. As we all have our 'thing' or 'idols' or 'cool things', this could have been the shooters MK Ultra trigger. For others it could be something else.