They deserve to be killed in the most horrific and painful way. Make them suffer long, painfully and terrified.
They will burn in the Lake of Fire forever when they die. God knows what is the worst way to suffer.
Fire up that rusty deli slicer and tie these subhuman animals to a conveyer belt in a straddle position. Utilize pay per view to generate funds for the psychological care these poor kids will require. Arrange for transportation of the remains to a pen of feral hogs.