Ethics: Weapons of Mass Destruction

I firmly believe that we as humans NEVER have the right to take another's life, under any circumstances.  I know what you're thinking.  Yes, even IF they are trying to kill you, I don't think it's moral to end their life. God alone has the right to take away someone's existence. Unfortunately, our society has a different opinion. It's just not very logical to cease making weapons, because other countries are continuing to develop new  ones and we would just become weaker. If we got rid of all weapons, the earth would be a lot better place to live in. For instance, child soldiers would no longer be a problem. In Sierra Leone, they're forcing children to fight and kill people in cold blood. That is NEVER okay. Their childhood was robbed from them.......they had to endure things grown men would be scarred by. Our world is facing disaster if we keep heading down this road.