A direct quote from that source:

While there is no clear evidence yet that Tyler Robinson was a formal member of Fuentes’ community, a Facebook photo suggests he engaged with Groyper memes.

I wouldn’t say that is conclusive he was a groyper. Seems we still don’t have enough evidence to figure out what his leanings where

It’s not caused by capitalism but exacerbated by it. The ratio of workers to retirees in 1960 was 5.1 to 1, it’s now 2.1 to 1. Sure if capital wasn’t extracting excess value maybe we could be fine at 2.1 to 1 but I doubt we would be at .5 to 1. At some point it becomes an issue