Half-orcs are the result of the union of a human and an orc. As such, they're tougher than your average humanoid and anytime they do something brash, impulsive, ill-timed, rude, and/or unnecessarily violent they can just claim that it's just their nature and all is forgiven! Despite this, half-orcs, like all real and fantasy races, can be as good or bad or as kind or cruel, as they choose to be.