Because it is not about man's capacity to consume, but about his ability to produce.

Decomposers consume because that's what their part of the food chain is. They are decomposers because they consume dead and decaying matter. They do not consume because they are decomposers.

Yes, there are actually 2 different ways. 1: If u kill a Blackwatch (if that's the name) they will drop their gun.

Go to the gun and press the same button you use to grab people and you pick up the gun. 2: You can buy an upgrade that allows you to consume people in 'stealth mode'

If you consume a Blackwatch you will automatically grab his gun to.

Yes. People consume food. You could also say that cars consume gas. Fire consumes oxygen. Consume is a versatile word.

The abstract noun for the verb to consume is consumption.