Why can’t Saudi Arabia fight their own wars?

all arabs can't fight,they are all pussys

It's easier to buy someone else's army.

There are about 20 million Saudis verses about 83 million Iranians.

There isnt a war going on in Saudi... Just that Iran since 1979 has wanted to rule the whole of the islamic world.. and they are the cause of stiring up conflict all over the islamic world... majority of the west gets their oil and gas from Saudiarabia and the middle east,. so right now USA has a vested interest in protecting this precious commodity.. otherwise if Iran took over, then your gas prices would skyrocket so high you'd wish you'd taken back your words from this question... USA is just protecting its interests in the middle eastern oil trade

They do. Saudi fights against Iran on Jemini soil.

That is the idea. We're just showing support.

Because Iran's military is something like four times the size in terms of manpower.