The risks that some people take with their homes is just inviting trouble. Keys under the door mat, cat flaps, etc............
As you may know, we cannot use force against an intruder, else we get charged with assault!.
The joke is when you get someone causing grief on your property, you call the police, who come eventually, [sometimes]
and they say "we cannot do anything about the case unless we catch them in the act", and the joke bit
is they say, "if they come back call us again"...... endless loop.