We call what you're doing "rationalization"
"They already have billions of dollars, how is $10 gonna hurt them?"
"They make their money dishonestly anyway"
etc., etc.
Well ever heard the saying "two wrongs don't make a right"? It means just because they are doing something wrong doesn't force your wrong and illegal action to be ok. YOU'RE STILL WRONG. And no I won't just ignore it, I'll do everything I possibly can to make sure people who break copyright laws get punished to the full extent of the law. There is nothing more that I'd like to see than a bunch of copyright infringers being locked up for 5 years.