Cheaters
Why do they do it? I believe they simply need to generate the feeling of being good at a game. Of course, how does this help you? If you win by cheating, that's no achievment. You just aren't good enough to win fair and square. What's wrong with you people?
Glitching is just as bad because, hey, let's face it. Glitching is simply taking advantage of mistakes to try to win. LAME.
If you do either of these things, you should rewrite your strategy. Winning by cheating and/or glitching isn't anything. It only shows you can't win, so you need to have an advantage to win.