What was the point of similarity between Captain Hagberd and old Mr. Carvil?

Both Captain Hagberd and old Mr. Carvil are impatient kind of person as they both get over-reaction on a certain level as their power to tackle things is null. Captain Hagberd when listen something about his son get out of mind and behave like a mad person and being on the same boat but being in different situation old Mr Carvil, a fat blind man had given himself up to a very lust of laziness, calls Bessie when he want something shouting loudly like he is not in control.