Although I dislike the idea of anyone misusing a handicapped parking spot—those spaces are created for people who need them, and they should be open and available to such people—I’d never approach anyone who appears to be able-bodied. Here are my reasons:
It isn’t my place or role to police handicapped spaces.
The driver may simply be helping someone who has a legitimate reason for a permit. As a very real example, I have a neighbor who’s a quadraplegic yet works full-time. His 100% healthy caretaker drives him to and from his job. At the end of the workday, the caretaker parks in a handicapped space, goes into the office building, and helps my neighbor get out of the building and into his car. When the caretaker arrives, should she be accosted by strangers who demand to know why she’s parking in a handicapped space?
Many conditions are invisible yet no less disabling.
Someone might have a temporary permit for an injury or illness. The person might be on the mend and getting stronger, yet still have a very valid reason for using a permit.
I don’t want to get punched in the face.
There are already plenty of nasty, confrontational people in this world. I have no interest in becoming one of them.