I don't know where to start answering your argument.

1. Some people claim pirating movies is not tantamount to stealing. Some people call violating open source licenses stealing. Those are not necessarily the same people.

2. The GPL is a legally enforceable license that grants you the rights to use and distribute code if you abide by the license. If you don't, you're not allowed to. Whether you agree this is stealing or not, it's against the law to use GPL code that belongs to someone else and violate the terms of the license.