I've been trying to tell people this for years. But the wealthy insist that "I've got gold, I'll just hire some poor people as guards. They'll be so desperate, they'll sell out their fellows for a bite of bread."
And they STILL don't see the hole in the logic.
If you're willing to betray your fellows below the poverty line, you should be FAR more willing to betray your employer - provided you're certain you can make an additional buck out of doing so.
The Romans had it right. You want peace from the lower classes? Let's see that Bread and Circuses supplied. Bread to feed us, entertainment to occupy us.