Show compassion to those who deserve it.
As for arrogant ones, I will tell you an incident that happened during the battle of Ohad. At the stage when Muslims were at Backfoot and prophet (pbuh) was also cornered and bruised, there was one companion who took the sword of Prophet (pbuh), wore a red bandana, and walked infront of the kaffirs with mighty arrogance. Prophet looking at that said even though Allah hate arrogance but that walk by the companion at that time infront of Kaffirs was the most beloved act by Allah.
Bottom line is, show compassion to those who deserve it, and treat the arrogants with utter disdain.