Deadbolt Locks Offer False Sense of Security… … when they are not installed properly.
Mythbusters inadvertently demonstrated the problems of the "short" screws that come with most strike plates in one of their episodes. They were testing "bashing through doors," and built a bunch of door frames, put doors in them, added locks, and proceeded to learn to slam through them - with rather great success, splitting the door trim.
Except for one, in which one of them rather nicely injured themselves (either Adam or Tory, can't recall which at the moment). The difference? 3" long screws into the studs, instead of the 3/4" or 1" screws that the others used.
I went through and replaced the screws securing all my strike plates after that episode.
Though, for most homes, all a lock will do is keep out the people who don't want to be there in the first place. They can be good if you don't want someone snooping around without you noticing, but unless you go out of your way to get "not abysmally shitty locks," anyone with a tiny bit of skill and a bump key or bump gun can pop your doors anyway without you noticing.
It should go without saying that the various internet connected and smartphone enabled locks are a security comedy if you care about security as well.