Thoughtlessness of romantic comedies

"Bringing Up Baby" has obvious forms of thoughtlessness that are meant to be funny, not evil. Leaving the window to the car open enough so that the tiger jumps from one car to the other is not evil, nor does it show a lack of a conscience. However I can see how an escalation of the behaviors or more serious behaviors could display a problem if there is no guilt. The female character does not take responsibility for her actions and since they are simple and will eventually not be as harmful as they seem to the main character, her actions are humorous and not upsetting or subject to negative judgments. There must be a fine line somewhere when thoughtlessness becomes unforgivable.