You need insurance to cover expenses that will cause you problems if they come up. Using insurance to pay for affordable hits or routine expenses is not very efficient.
Someone breaks in and steals my computer, I should be self financing that as I can afford to repair my door/window and replace the computer without being much of a problem. My house gets torn down by zombies or enraged Justin Beiber fans, I am financially fucked.
Oddly enough the wealthier you are, the less insurance you need. Should probably have insurance vs getting sued though double plus so in the US, double double plus so if you are rich.