Does Unrest optimally go down on its own?

[The Panther]

Each 10% reduction in taxes reduces unrest by aproximately 3.33 points if you own the dominion. If you want to clear 17 unrest quickly, drop the tax rate to 50 for one turn. It will clear to 0 or 1 on the following turn and stay at 0 indefinitely as long as you have dominion there or until you get a bad event.

Of course, one of the hidden blood sites will create unrest each turn:
For the 5 unrest site, keep the tax rate at 80% if you do not want it to grow.
The 10 unrest site requires 70%.
The 15 unrest site requires 50%, and you want to find that site as quick as possible. A blood mage can summon devils after you find it!