Because it is important that those who make war, the combatants, obey the rules that impose limits on

It’s a person who imagines and creates something original.

That’s to say, they invent a technical process that did not exist before. 

They are therefore the creator of a new object that makes our daily life easier.

Does this mean that we can all become inventors?   

Yes, indeed, anyone can have a new technical idea that can be produced industrially.