Being Polish and trustworthy...a paradox?

I just noted in the "smiling" thread about a guy who appeared to be an average USA citizen, though spoke Polish, being surprised at "new" Polish people speaking in Polish then realising he also spoke it too.......they then turned heel in either embarassment or fear or inadequacy and left the scene pretty quickly.

However is this due to their not trusting someone overhearing their conversation and not identifying themselves ( legacy of not trusting anyone back home, communism etc), are Polish people a naturally very suspicious nation, or trusting no-one fullstop, who isn't a friend family member?

I dont know if it is true but Polish friends have told me that Poles are generally distrustful of people because of the legacy of communism and that it takes a while before they gain trust in new friends or lovers.

...well... yeah we are suspicious sometimes, but communism is not the reason....i don't know what is the reason for it really. First of all ,there is a one rule: In 95% one Pole abroad is untrustworthy to another Pole abroad as well. I know it souds daft, but you can't help it. Can ya ?