Is profanity sinful/morally wrong?

[Alcon]

Kevin Smith is a Christian. Take a look at his movies.

Tons of murders, probably most, are Christians too!

[Alcon]

that's the defintion of legality, not morality. 

Nah, not even the definition of legality.  It's the definition of morality to many of us secular folk.  The law is perfectly happy to sit idly by while you smoke and drink yourself to death with dependent children.  On the same token, it's happy to allow parents to do virtually anything short of beat their children to death, without legal intervention.  That ain't legality.

[Alcon]

that's the defintion of legality, not morality. 

Nah, not even the definition of legality.  It's the definition of morality to many of us secular folk.  The law is perfectly happy to sit idly by while you smoke and drink yourself to death with independent children.  On the same token, it's happy to allow parents to do virtually anything short of beat their children to death without legal intervention.  That ain't legality.

in your case, beatings are understandable

Yeah, I'd whup me too