the politeness may even have to do with new laws, or that someone is enforcing the law.
many areas have laws against "aggressive panhandling" .
in Santa Cruz, they can only use signs that ask for change, they cant say anything.
there are laws also against asknig for money near atms, i get really mad if i am asked near one.
some people also have just maybe learned it is the best way to actually get a little change, be polite, ask for a small amount.
you are not being cased for a mugging, at least i REAlly doubt it.
Austin is also the Berkeley of the south, we ahve a lot of people bouncing between here and there, it is known as a "sort of almost cool town in TX" to most hippy types, people who are from their claim it's a hip place. so you will have more homeless people who are just plain dirty hippies without jobs, and other homeless using their tactics.
**the angry crackhead panhandler never wanted to panhandle, he was forced into it by his own stupidity, and hates it but must get that rock.
the hippy type just doesnt care about a roof and is generally happy with whatever people can spare. so they can be friendly, and then of course crackheads can see this tactic in use and copy it, but the point is the people who are so nice about panhandling, especially in a city like Austin, i would call it you have more homeless by choice rather than by drugs, and they are less angry.