I agree. But repeatedly viewing that type of content, while also searching for how to make/acquire weapons.
I mean, accidentally seeing that content or even viewing a few times isn't much to me. Nor is wanting to buy guns, or dooms day prep, knowing how to prep explosives, to some extent.
Or viewing something racist to learn the history of something, but constantly searching or posting hate material
But a combination of it all. I mean, certain searches could set off pings, and if you get 100 in a certain period of time, you need a consult.
In a situation like this, they could even add extra parameters, such a searches thst ask ways to package things, or avoid surveillance, etc.