Every time I turn on ESPN some high profile college football player is getting kicked off

Why is that every time I turn on ESPN some high profile college football player is getting kicked off? This off season i haven seen the most high profile players make some of the dumbest mistakes to no longer be able to participate on there team. Its like they have worked so hard there whole life for this opportunity to play college football and have that chance to make it to the NFL and right when its seems like its about to pay off they do something that causes them to not have that opportunity any more. Me being a college athlete myself i do not get this. Only 4 years of hard work and dedication for some it may be shorter to be set for life whether its playing ball on the professional level or earning that college degree.