>My belief is that computer security is highly overrated. With a decent firewall, which every router has these days, only your own activity can expose you to attack from hostile actors. All internet browsers also help you by warning when you are about to do something stupid like executing code from a remote source.

This is a ridiculous thing to say. The reason that there are so few misleading ads, so few zero days being exploited, and in general a much less tricky landscape today is because the unyielding and unrelenting efforts of people improving computer security.