Why filesharing programs aren't illegal!

Many of you have may been wondering: "Is it legal to have LimeWire installed on my computer omfgzlolhax?"

Yes, it is!
- and not only LimeWire. Also other P2P Programs !

Why !? - You can download free songzz and moviezz and appzz!?1+oneone ::
Yes, but !
A filesharing program is just a program that download other peoples shared files. These files can be chosen by themselves .
I have a shared folder, called "Shared" on my computer, with all the stuff that maybe can be useful for other peoples. That's not illegal!
It is illegal to download other guys MP3's and AVI's and EXE's , since they maybe have been paid for.
But, there's a extremely low chance of getting caught!
- That was it..