Speech didn't kill them a single bit more than water did, if you're using that logic:
What killed Holocaust victims?
Gas.
Why did they let that happen?
Because the people forcing them to go in had guns.
Why did they force them?
Because they worked under a man who commanded that they be killed.
How was he alive?
Because he drank water, preventing him from dying of dehydration.
No, I don't. The motive in the case of speech is to silence a populus/punish dissenters. The motive in the case of guns is quite overwhelmingly safety.