The old PC/PS1 flight game G-Police has an unlimited number of civilians flying or driving cluelessly about, an unlimited magazine of machine gun ammo, and no such thing as police brutality.
Made worse in Crime Cities, which has the same thing going except the traffic is even more intense. Coupled with the tendency of civilian vehicles to die if looked at sternly, this makes it virtually impossible to complete the game without shooting down a fair number of innocents.
When the Walker does enough damage to an enemy helicopter, he may choose to stop firing and watch the pilot desperately struggle with his crippled machine. Eventually, the helicopter will come down and explode, sending the screaming pilot in the air.