Why exactly is AC Milan lost to this team is what I really do not understand. It is really no a good one for AC Milan at this time but it just like a case of one of the times that football happens to a team and even a big team loose and there are times where a smaller team could loose or can win, we'll I do not really know about the aspect you made mention of the criminality so I cannot comment on that but I just see this as football.
In Serie A matches things like this are commonplace somehow the teams that are considered strong are defeated when playing at home well, this is what happened to AC Milan in the last match even though they dominate from all sides but Cremonese managed to win by scoring 2 goals with 4 shots while AC Milan fired 24 shots

seems a bit funny but this is the fact. There is nothing to be surprised about and the League has just started I mean there will be more surprises.
It seems that Milan have a lack of (decisive) strikers in the team. Pulisic is more link-up player and Santiago Gimenez is not convincing in his position. So attacking activity of Milan often remains incomplete (and shot accuracy is low as was the case in the match against Cremonese). And maybe some transfers are needed for Milan to improve its attacking line.