These type of arguments do not look at the big picture.

Stealing from big companies can sound noble if you only look at the theft itself. But when you take a step back and look at how the money flows, you will see that the company does just take the loss and do nothing. What actually happens is the company sees the theft as an additional cost, and includes those costs in the prices charged to everyone else. Resulting in the money to cover the theft coming from other customers.

So the net result of stealing from a big company, is stealing from ever other customer.