For one thing, the people who were going there guarding that event, they weren't there as officials hired by the state, which they would likely have to be if they were there guarding a school. That would involve like a super complicated administrative process to happen, whereas this is just people taking it upon themselves to show up and practice their Second Amendment rights, which Owen should love. Secondly, there's a bit of a difference between these events and schools. If Proud Boys and groups of right-wing lunatics fed a steady diet of sensational and bigoted narratives about how the schools were secret grooming programs targeting kids, were showing up at schools routinely to disrupt things, and if there were bomb threats being directed at schools that were pointed out by anti-LGBTQ social media accounts, and an entire section of the media was obsessed with demonizing schools and teachers, in that instance, maybe Antifa would show up at schools. That isn't happening in the case of schools, but it is in the case of LGBTQ spaces, particularly focused around drag queen storytime, so it kind of makes sense.