It seems to me at times that many unprepared people ( with the right/wrong type of mindset ) will just prefer to loot others in case of emergency. Telling them about the signs and means of preparedness is just helping them to recognize and prey on honest prepared folks who spent lots of time and money preparing.
I understand your point now, but I fail to see how keeping people in the dark about preparedness would eliminate or even reduce the the potential for people looting your possessions. Do you really think that desperate people bereft of gear are going to care that your BOB is drab or your car is a beater? And if you are worried about crowds and looters then save yourself the stress--they will be around whether you help a few poor souls beforehand or not. But by helping people prepare you might reduce that number by a few, or even gain some allies should the SHTF.