The knights of olde have been heavily romanticized over the years thanks to literature and pop culture, but despite what your favorite fictional stories say knights were big ol' jerks.
I mean, what kind of hero would pillage, rape and slaughter their serf's livestock without moral objection or fear of punishment? A medieval knight, that's who!
Many medieval knights had nothing better to do than hang out on their plot of land all day, since they only worked about 40 days a year, and when those alpha male rich kids in plate mail armor got bored, blood would flow.
But battle was rarely a deadly affair for medieval knights, because common blooded foot soldiers could be punished for killing a knight since they were worth more when held for ransom.