One could serve a bad cause without being a bad man.

Throughout history, men have given up their lives for worse causes than that.

And they'll be so far from here that they'll give it all up as a bad cause.

"And sometimes good men die in a bad cause, when it comes to war."

I can't think of a worse cause to die for.

"You put your worst cause last and in the chief place," Thorin answered.

They were imaginative, but it was imagination in a bad cause.

He tried to decide which would be the worse cause for dismay.

For a bad cause, but what they did had nothing to do with that.

This means that an action cannot be founded on a bad cause.