If my neighbours had guns, I also wouldn't trust on a rusty nail to keep my gate up, Di. But like with lots of things in life, you weigh up the likelihood against the consequences. I regard the likelihood of my child drowning when swimming unsupervised moderately high and the consequences devastating, so I supervise her. On the other hand, the likelihood of her falling out of a tree is about the same, but the consequence is likely to be broken bones instead of death, so I take the risk.
Likelihood of my dog escaping is low, consequence is pretty minor as she is friendly to people and dogs, there are no cattle nor farmers with guns, barely any traffic in our street, no busy roads nearby and lots of people in the neighbourhood know us. But if it were my own property, I would still put in a new gate eventually. It being a rental makes it not worth the cost and effort for the benefit it would give us.