I can see your point, the whole furore this week has been unnecessary & blown well out of proportion.
However I also think that clubs, as cornerstones of the community, see it as appropriate that they should commemorate these events by having the minutes silence and in recent years the poppies on the shirts. Yes we are at the game to be entertained, as at the cinema. But cinemas are just businesses with no emotional investment from their patrons, unlike football clubs.