Have we become used to or immune to mass shootings?

[Undertoad]

Teen, stopped before his rampage, journaled about planning his school shooting

I think a lot of them study the previous ones, and this guy did:

O’Connor wrote that he wanted the death count to be as high as possible so that the shooting would be infamous, according to court papers. He went into detail about building pressure-cooker bombs, activating inert grenades and deploying explosives for maximum casualties.

"I need to make this count," O’Connor reportedly wrote. "I’ve been reviewing many mass shootings/bombings (and attempted bombings) I’m learning from past shooters/bombers mistakes."

I hope that these types do not figure out any way other than guns to kill large numbers of people, because if they do, that will just become the new way.