@TUSF I understand the idea of making "an example" out of someone and I also understand that if you murder an entire village, then you will be left with no one to take care of that land and lose way more money.
If he really wanted to make an example out of them then maybe he should have only killed a few so that the rest live to tell the tale and never forget the punishment for trying to run away.
Even then, since the problem is that they can't pay the king's stupid taxes, killing them won't solve anything. If people know they can't pay the taxes and they can't escape either, then it's more likely they will feel cornered and do something desperate since their options are pretty much dying of hunger due to being poor or being killed.
So congratulations, King Fuckup, due to your lack of understanding how to rule your own kingdom, you just forced your own people to start a rebellion or to help a foreign power invade your lands with the hope that its rule will be less tyrannical.