This is another heady topic, Lisa, and a good one.
I stole something when I was in high school - a cowl neck angora sweater from Woolworths. Well, I didn't technically steal it, but I did switch price tags so that I could afford it. Like you, I felt so badly about it that I never stole anything again.
But having said that, I feel the same way about stealing as I do about killing. It all depends upon one's intentions when they do it. I feel that repeated stealing will only serve to keep one in a state of self-loathing and denial. It keeps a person in a locked-in state of entitlement and disregard for others.
However, the petty thefts of the common citizen are not the only, nor the worst offenders. It is my feeling that corporations and industries that charge far more money than the actual value of an item or service are just as accountable for acts of grand thievery. Their intentions are not to make a fair profit, but to "steal" as much money as possible, under the guise of "sales." I feel that the collapse we are now experiencing is a loud and wise lesson to learn - for all of us to be wary of what we take from others, and why.
Shay