If possible, so far as it depends on you, be at peace with all men.
This is an action we must pursue. We can't stand by idle, we must actively make peace. Hebrews states it from the acting point of view more clearly.
Pursue peace with all men, and the sanctification without which no one will see the Lord.
Everyone deep down inside craves peace. Nobody wants to live in fear. No matter if that fear is great or small it is not appreciated or enjoyed. A terrorist does not enjoy being afraid for his life, having to continually be on the run. Neither does a relatively "good" person enjoy the fear of being pulled over by a policeman when they are speeding and having to face the dread of paying a fine or going to court. Nor does anyone enjoy being robbed of their personal property. Most never come to an understanding of the only true peace that God alone gives when a person submits their life to God's authority.