What if someone steals something from you?

What can you do when you're a victim of theft and you don't know who the culprit is? What if I steal his life when I randomly attack people I suspect? I think government steals a lot too and I shouldn't be prosecuted for taking out the low lives of society who stole my mobile phone, gps device, car keys and remote, 2 x dictaphones and who knows why and what else they have taken when the opportunity has arisen. All I can see is another cycle to complete!!!