Necessity of car insurance depends upon your preferences.
If you're very much concerned about your car getting damaged, stolen or accidented and you don't want to bear that loss, then you should definitely opt for car insurance.
If you know that you can bear the loss of your car in case of any misfortune, then its not necessary at all.
I never got any of my vehicle insured and got 1 stolen too, but still i believe it was my mistake that i parked it without being under my custody and now have to bear the loss.