What happened after 2018 that has the squirrels so ready to attack (or people worried about them attacking)?

https://www.tylervigen.com/spurious/research-papers/2045_building-bridges-exploring-the-nexus-between-bachelors-degrees-in-architecture-and-related-services-and-google-searches-for-attacked-by-a-squirrel.pdf

Perhaps the architects neglected mandatory squirrel housing, which was standard up until about 1952 but then has fallen off quite a bit.

I look forwards to this communities existence 🍻