Why fight the trend?

If you guys are still short you deserve to lose everything.

No excuse for remaining stubborn.

 

Everyone was so happy yesterday and today they give it all back and more.

 

When you are in the trend it is easy.

Why fight it.

 

Basically two ways of trading, trend following and reversion to the mean. Most systems fall somewhere in between these two.

 

Really?

Also, what about arbitrage, etc.