Does an apology for a statement mean that the statement was never made? Does it effectively "unmake" the statement? Does it mean that the speaker does not believe what the speaker said in the statement?
Altogether too often, none of the above. "I'm sorry if anyone was offended," does not mean I'm sorry I said it, and even less does it mean that I do not actually believe whatever it was that I said. "I'm sorry I said it," is just as bad, it only says that I'm sorry I got caught.
If I make an error, do I make it okay by saying that someone else also made an error? Of course not. To suggest so is ridiculous. "Listen, judge, yes I robbed the bank, but it's okay because Dillinger robbed even more banks than I did so you should give me a pass." And yet politicians do this all the time. In effect that's what Nancy Pelosi is saying above.
Again, before you start flaming me, I'm a Democrat, vote Democratic, and I hate Trump just as much as you do. I just don't like hypocrisy regardless of who's doing it.