There are some reasons they may have to: risk of being kidnapped, risk of random people bothering them for money, risk of random crazy people attacking them, illogicality of waiting hours in a TSA line for no other reason than "that's what poor people do".
There are some reasons they may have to: risk of being kidnapped, risk of random people bothering them for money, risk of random crazy people attacking them, illogicality of waiting hours in a TSA line for no other reason than "that's what poor people do".