I know it's not as easy as one might think, but when you see an ump who takes the bat out of someones hands and it changes the game entirely then it makes you wonder if they may have done it on purpose! And when you see an ump so drastically change his strike zone later in the game then it makes you wonder again. (After all, as you said, they are only human and sometims their biases are bound to come into play). Not all do this but you will have to admit that some do! Don't get bent out of shape unless you are one I am referring to!