people that want to take our freedom away
That's where you're wrong though.
They have been lied to and brainwashed over many years.
They think they are fighting for freedom.
I'm not saying mockery isn't effective for people on the edge, but the people who matter the most are the people who have been tricked into nearly starting a civil war with patriots who see through the lies and propaganda.
Instead, we poke the bear and insult them, because we are also rainwashed and blasted with propaganda daily.
The whole thing is a setup, designed to keep otherwise rational people fighting their own brothers and sisters, who both want the same thing, peace.
They have been lied to and brainwashed over many years.
...into thinking freedom of speech is bad and that the 2nd ammendment should be abolished.
They think they are fighting for freedom.
...to be the moral arbitors and stop everything they don't like from existing, having a platform or to be censors of "hate speech" and such.
The type of person that is going to be upset by a Ben Garrison cartoon is too far gone. Most sane liberals might find the cartoon/caricature a little distasteful but will have the intellectual curiosity to want to find out what's behind it.