Blame and Guilt

Guilt is what we feel when we are to blame for something that we feel to be wrong or damaging or to have hurt someone in someway, weather it be physically, mentally or emotionally, so why is it that so many of us feel guilt when we are not to blame. There are many examples in which we may blame ourselves although no one else blames us, or even when we know that what went wrong was not our fault.
Sometimes we can feel guilty about things that we could not have stopped, that were totally outside of our control, like when a loved one falls sick and is hospitalised.
Sometimes we can blame ourselves for things that perhaps we could have prevented but we could not have realized until they had happened. Perhaps if we had not parked in the street, the car would not have been broken into, perhaps if i had payed a bit more for that condom it might not have broken.
The things that many of us feel the most guilt for, with the least reason to feel guilty for are the things that we may have been able to prevent, but if we had known how to we would have diffidently done it without any hesitance or resistance. The thought that 'perhaps if i had eaten better i would not have had that miscarriage and my baby would still be alive', does not make it our fault in fact it means that it is most diffidently not, for if we had known that from the start we would have done that and it would not have happened at all. The same goes for the thought that perhaps 'if we had listened to him he would not have killed himself and would still be here', if we know, that we would have done that if we had only known, then it could not possibly be our fault. If we were capable of changing what has happened we would have done it, so we can not be to blame for it. This knowledge should be enough for us not to feel guilt, but it normally takes more than reality and facts to change our feelings. Sometimes our feelings make us feel guilty even though we are not to blame.