You need to use the right threat model

found on The Meta Picture

I bet the person who put up that bird feeder was expecting to just have to deal with squirrels, not something orders of magnitude larger. That changes everything and the defenses that might have worked against a squirrel are probably not going to be effective against a bear.

Just think what would happen if bears also took over the squirrel's role in the cyber security threat landscape as well. As much damage as a squirrel can do to critical infrastructure, I have to think a bear can do more.