Bell Ringer Guilt — Daily Dilemma

A listener wrote in the following daily dilemma for Friday, December 16th.  Here is what they wrote:

"Should I feel guilty for not giving money to the SalvaSalvation Army bell ringers even though I gave money at a separate location?  I can't help, but feel guilty not giving each and every time.  It's difficult to go do my holiday shopping and not run into at least one bell ringer.  They don't even ask, but I try and avoid eye contact.  What is the best thing to do?"

Do you go through the same situation?  What do you think this person should do?