But it also says in many places that we should not have peace with others. You need to read the "good book," to know when it is good and when it is unacceptable.
In Yirmiyah (48:10) it says "...Cursed is he who holds back his sword from blood (from killing Moab)..." The explanation is that God says to punish Moab, who are you to question or not cooperate. This concept is all over Jewish law. "There's a time to love and a time to hate.." ... ".. a time to kill and a time to cure... "
(Kohelet Perek #3)
If a person or people are chasing others away from Mitzvot, we are all expected, or better yet, required to stand up and fight them, insult them, do anything we can to stop them.