I don't think it's right to release cockroaches at McDonalds. Those places are usually owned by local businessmen, not by the McDonald's corporation. So when you do something like that, you could be costing your neighbor money, not some faceless corporation. Go release your cockroaches at Wal-Mart instead.
It's not right to steal from the phone company. I've never pretended that I'm not a law breaker when it's comes to stealing phone calls, just because "the long distance lines are just sitting there, not being used." You can reason that they screw us all the time with insane rates so they deserve it and you're probably right, but you are still stealing.
But I still believe that I'm doing nothing morally wrong by giving myself a free extended warranty on expensive consumer electronics. When companies sell $300 gaming machines, they shouldn't overheat or quit reading discs after just a year. That's what I'm trying to say in this thread. Not that we should screw over every big company just because we can. Just that we should get our money's worth when we buy things from them instead of getting completely screwed.