Perhaps because the ACLU is a hypocritical organization that is selective about which liberties it seeks to protect?
give me a good reason.
I'll give you one, guns. The ACLU has chosen not to protect that liberty for whatever reason. Really, they ain't as bad as the right often make them out to be (I'm certainly guilty of it in the past). Give me any random court case the ACLU has been involved with and I'm likely going to come down on their side.
But the guns thing keeps holding me back.
(and I still don't own a gun nor have any immediate need/desire to get one so leave the "gun nut" insults for somebody else)