Is a lack of success with girls/sexuality a major cause for mass shootings?

[dead0man]

Look at social trust levels. Higher social trust means that generally people feel less need to own guns, and reduces the level of people who are potential mass shooters too.
There's a reason social trust levels declining over the past (40?) years also has paralleled an increase in gun violence.

but gun violence peaked in the 90s and went way down for most of the next two decades, has "social trust" (whatever the hell that means) been going up since then?

[dead0man]

Look at social trust levels. Higher social trust means that generally people feel less need to own guns, and reduces the level of people who are potential mass shooters too.
There's a reason social trust levels declining over the past (40?) years also has paralleled an increase in gun violence.

but gun violence peaked in the 90s and went way down for most of the next two decades, has "social trust" (whatever the hell that means) been going up since then?

Which statistics are you looking at? I'm curious, I had the impression they were going up overall.