Because humans are stupid
They're quite profitable...
Because we use our intelligence to not only help us but to also kill us. Nukes were created in "defense", it amazing what people tell themselves. I know smoking is bad for me, but I do it because I enjoy it and I can. Nukes are bad for everyone, so I don't think it's fair to lump them together.
I think because human nature is competitive ..always having to win..power hungry. We are also natural hedonist ..we like to feel good ,even if it's bad for us and businesses know this so they offer and entice us with addictive substances.. because we're weak when we are tempted, they make big money...oh and as humans we're greedy beyond compare.I think individuals can be smart and good individually but, as a group...we suck.
Organized religion mixed with politics. Corrupt, power-hungry people exploit those two to do whatever serves them best at any given time.
so we don't live very long and collect our social security benefits, (that we paid into for years and years) that the great government squandered away.
because someone is willing to buy it
We do not view this as power we view it as addiction...I would rather play drums fro 32 numbers in front of kids and families..
To feel powerful?
When the monkeys kicked us out of the trees we were to stupid to climb back up...
You will have fo study "supply & demand" to understand how demand leads supply, not the ofher way round.