Here's a somewhat cynical take: marketeers do it for the money. Period. Back when I a student myself, I met many types of students. Marketing students could roughly be classified as 'in here for the money' and 'I do not know what to do otherwise'. There was no real sense of activism or any desire to make the world a better place (except for themselves that is).

Throughout my career I met with many marketeers. They were nice to work with, but I never met anybody in marketing who was inclined to use their skills for a good cause.