Whether it makes sense isn't the issue. The question is whether it's morally right.
For the safety of myself and my family, it probably makes sense for me to shoot anyone who comes near my house (at least in the short term - but I think your logic also only works in the short term, as current world affairs shows). But I think we'll all agree that I shouldn't do this.
To ensure my own lifestyle I should also cheat on my taxes, sneak items out of the grocery store in the bottom of my cart, take credit for other people's ideas at work, and plenty of other things for which the chances of, or cost of, getting caught is low. Nevertheless, these are things that I ought not to do.
For the safety of myself and my family, it probably makes sense for me to shoot anyone who comes near my house (at least in the short term - but I think your logic also only works in the short term, as current world affairs shows). But I think we'll all agree that I shouldn't do this.
To ensure my own lifestyle I should also cheat on my taxes, sneak items out of the grocery store in the bottom of my cart, take credit for other people's ideas at work, and plenty of other things for which the chances of, or cost of, getting caught is low. Nevertheless, these are things that I ought not to do.
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