maybe a stupid question

Being a north of the border person who may get to spend 6 solid months in and near Zihua, it occurred to me that in el centro at night, given the plethora of resources, municipal and estal policia, army and navy, that a small portion of this "protection" could be put on foot or motorcycle during the higher crime periods : evenings and weekends? It would seem less expensive and more effective . Maybe that is not the point of the multiple military and police vehicles I observed at 6:00pm on 12/7 between la ropa and el centro? I suspect the "bad guys" are able to text each other ahead of time as the check points are being set up.

The bad guys are in stolen cars loaded with AK 47s driving around shooting at each other. I tend to think that a policeman on foot would be of no use. Of course the truckloads of policia don't show up until they are sure the bad guys are gone so. . .