>100% justified.
So long as you ignore the part where the 'suspect' stopped their car and waved the Heroes to drive ahead, instead, the Masked and Armed Heroes decided to exit their own vehicle, try to open the 'suspect's' door and drew their weapons… putting themselves in "harm's way" and executed the suspect for Failure to Comply (with unlawful demands).
You and your Heroes are active participants in the Mess.