Not sure why Salman didn't slaughter everyone in the old regime in the first place. This is the same mistake in the plan to save the US.
If any trace of the DS is left alive at the end of this, they will be back eventually and regain power. At that point your kids and grandkids can kiss their dreams of freedom goodbye because they will never, ever, in a million years allow this to happen to them again. They will slaughter every last Patriots the moment they can.
They won't make the mistake of compassion like we do. It's our biggest weakness.