Amen to that…it is sometimes difficult not to get upset after you have been ko'd of a tourney by a fish making a poor play.  However, as you said, you want them making this play.  What makes things even more difficult to handle is the suck outs, but when you get it in good 80%+ of the time you are going to get sucked out on.  All I tell myself is that you got it in good and how the cards fall we have no control over.  You want the fish to not use the $23.95 membership on TPE:) I think  the most important thing prior to sitting down to play a session is to be in the best state of mind possible to play to avoid bad plays/tilt.  If you are mentally not in it that particular day, don't play. Variance is a big part of mtts, but as long as you continue to make the right plays, the edge will swing in your favor. 

The forums and having a poker buddy(s) is huge to to discuss hands and particular spots that you find yourself in.  It is also great to have that person to talk to that shares the same passion in the game to get you through the downswings.  I have experienced a great upswing of late, but I had to have a visit with KB not to long ago at a time that I thought I would never win a race at a critical moment again.  He helped me keep things in perspective and continue to play my “A” game. 

This game is evolving daily which makes it great..something that I also tell myself is that you are never losing, only learning:)