Huh. That list of suspicious actions is kinda strange when you think about it...
Demands identity privacy? In an age of rampant identity theft, NOT showing your ID except when absolutely necessary is just being smart. I'd be intensely suspicious of a store that cards customers who are buying cookies (the single item I'm most likely to buy in a surplus store is MRE cookies, I love the things).
Insists on paying with cash? I don't own a credit card, I only use a debit card for my groceries and gas. I pay cash for everything else. Since when is paying with legal tender an indication of terrorist activity?
Changes appearance? How would you define this in such a way, that someone with little or no common sense can't misconstrue it? Does this mean that to avoid being reported to the feds as a possible terrorist, I'm not allowed to change clothes between visits to a store?
Missing fingers? Chemical burns? My friends and I are definitely blue collar types. A fair number of people I know have suffered workplace accidents, and a few of those leave lasting marks. And last time I checked, discrimination against someone for a physical disability isn't legal.
Racism/religion? Last I checked, both varieties of speech fall under the first amendment. For a government agency to circulate a flier describing exercise of a protected right to be a sign of terrorist activities isn't good.
Condones violence? Advocates violence in support of a cause? That describes almost every cop I've ever met. It describes my sister's ex, who is active duty army (ranger). It probably describes the FBI agents who helped draft that flier.
Displays interest in odd uses of items? That describes me, more often than not. I take things apart and use the parts for various things. I own a lamp that was five different things in the past (only two of which were lamps). I've found that surplus flashlight pouches are the ideal magazine pouch for the magazines my paintball gun uses.
Possesses little knowledge of purchased items? So...all those terrorist training camps we hear about don't actually TEACH the terrorists to use equipment? This one is one of the weirdest of the lot, since it would tend to direct greater scrutiny to a housewife stocking an earthquake kit than it would a gung-ho nutjob who knows every single possible use for the contents of an MRE.
Makes bulk purchases? I could sortof see it for things like bipods and nightvision gear. But the entire point of MREs is bulk purchases; Buying just one doesn't do your emergency kit a whole lot of good. And how many is bulk, anyway? Is a box of ammunition bulk? A can? A crate? Depending on who you talk to, buying enough to fill a magazine could be declared a bulk purchase.
Going by that list, my elderly mother, the woman who wants to ban all guns, knives and explosives, who is a devoted pacifist, who is working off and on stocking a disaster kit, is more likely to be the subject of a terrorism investigation than a highly trained actual terrorist!