As Noliar notes on RPGnet about The Crimson Horror:
Context is everything.
Strax is comic relief because he's not in charge and his suggestions get turned down. All that humorous ineptitude is at being a civilian. We saw a few seconds of him getting to do violence because that was all it took before his enemies were down or fleeing.
Imagine thousands of Straxes making no effort to accommodate less warlike species, the same inclination to use overwhelmingly lethal force and you are in their way. Not so funny.