Detroit Lions/Denver Broncos

I always assumed 'amateur sporting events' and 'pro sporting events' meant the same quality of sportsmanship play.  I'm now seriously having my doubts.  I watched the Detroit/Denver game last night, at least most of it.  One Detroit play lowered his head and slammed into the helmet of an opposing player.  That player had to go off of the field to see if he had gotten a concussion.  Accident?  Didn't appear so.  More good sportsmanship and other teams also do the following.  I watched a Lion continually rotate and raise his arms to get the home spectators to make lots of noise so the visiting team couldn't hear their quarterback's calls.  Apparently that Lion didn't think his team  could get ahead by just 'good' playing.  Must there always be what appears to be 'dirty tricks' in an attempt to come out ahead?  Shame on those players and spectators who must behave in this manner.  Come on Head Coach.  If you remain silent is this your way of giving approval?............................marge