Yes, in most cases Bipolar 1 patients feel "guilty" or ashamed or upset about things they might have done during mania.
Of course, it is only with proper medication when the mania is controlled and stopped that the person will be able to think like that.

You must understand that when a person is manic, their perception of the world and their existence in the world is different. Most believe they are unstoppable, nothing could hurt them, there is TONS of things to do and see, thoughts are racing, colors are bright and vivid, and time does not stop.