I've often heard Magnus Carlsen describe how you should worry about your own play and have faith in that rather than relying on your opponent to make a mistake. Two wrongs doesn't make a right, so I consider it a hollow victory to continue after your mistakes and thus effectively ignoring that you indeed made one.
I believe that you are seriously misinterpreting what Magnus said. That sentence doesn't have the meaning that you think it has. He is talking against unsound tricks and "hope chess" and not against fighting in bad positions.
Everyone makes mistakes. The person who makes the second-to-last mistake wins.
My least favorite opponents are those who do not resign at all; even when they are almost entirely sure to lose with maybe 10+ minutes left on both clocks.
If they are only "almost entirely sure to lose" they shouldn't resign. Resign only when you are entirely sure to lose.
Almost everyone resigns too often. This leads to hilarious blunders, like when a superGM (was it Giri?) resigned in a known draw position.
Speaking of grand masters, I've often heard Magnus Carlsen describe how you should worry about your own play and have faith in that rather than relying on your opponent to make a mistake. Two wrongs doesn't make a right, so I consider it a hollow victory to continue after your mistakes and thus effectively ignoring that you indeed made one. This is why I argue that wasting time like that just to win an unfair victory is counter constructive.
Mpaetz mentioned that people often blunder in complicated positions even when they have the lead. I don't. I just get so extremely bored and unmotivated that I'd rather lose just to get it over with and start just making careless moves. It sucks the joy right out of the game. Similar to how Justbefair mentioned when people start idling in 30 minutes games and suddenly start playing when there is 1 minute left on the clock hoping the opponent has left. This has nothing to do with chess. Idling / stalling / quitting is against the fair play rules for that reason.