I can see you and he use the same paint brush. Since you're so into rights, then you will acknowledge the rights of these government employees to petition the government not to allow this rude, ignorant person who insulted their religion to speak at their place of employment.
You can take comfort that all rude and ignorant people share those rights, as well as the right to choose eternal suffering if they so desire... though such a choice is perhaps most truly ignorant.
For those who so choose to call someone who would try to dissuade them from that choice "ignorant" is priceless... despite that it's a guaranteed right.
Just like Timothy Robbins, all Americans have such rights, but must share also the right to endure the consequences of their choices without complaint, as the choice was theirs in the first place..
I know of no other instance in America where one was motivated solely by religion to the killing of superior officers or refuse to carry out his employment obligations as an FBI agent.