Why does a flush beat a straight?

[PantsOnFire]

Another thing that throws a lot of people off is the fact that there are usually more flushes as made hands in holdem than straights.

I can think of at least two solid reasons for this. One is the simple fact that lots of players like two suited cards. And they also don't like laying down a four flush hand. The other is that a lot of draws to straights are inside draws and these are given up very often.