I'm not saying it definately does happen, but when a goal is disallowed when the team actually DID score or when a goal is allowed when it was off side etc, it can knock the team's confidence and maybe stop them from playing to their full potential. We will never know if a team would have played differently if the right decision had been made.

The same goes for when Kaka was sent off and didn't do anything wrong.

These rules are ridiculous. I think they need to start using video technology because it's causing fans and players getting really mad, IE Mexico.

I read somewhere that Fifa officials said they absolutely refuse the idea of having replays shown on the screen, so I'm guessing that means they don't intend on doing anything about it.

There has to be a balance.
Goal line technology is REALLY needed. But having every issue potentially contended would be awful, as the game would get really stop and start. There are always going to be odd mistakes by referees, but some of them are so easy to avoid.

It's a huge problem