Okay, so a friend suddenly gives you a large amount of money. Is it okay to accept it? Most probably yes.
But, what if he robbed a bank, and you knew it. Is it still okay to accept it? If he lies and says that he didn't rob the bank?
You didn't do anything wrong, and he lied to you, does these two facts make it okay to accept stolen money? No.
If someone does something wrong, it is also wrong for you to profit from that. You post to slashdot, you know for a fact that ISPs are lying, yet you cling on to the lie of unlimited bandwidth and try to shift all the responsibility to the ISP.