Regarding the letter complaining about people using handicapped spaces inappropriately or selfishly.
Many people would be perfectly willing to allow the author to have the space, recognizing her greater need, it they knew, but you cannot know when you park if someone of greater need will be coming along – or would the author simply expect that no one without the absolute greatest need ever use a handicapped spot, regardless of the fact that they legally qualify?
The author also, like many people, makes a rush to judgment on others’ need for the space. You cannot judge a person’s level of handicap simply on the basis of how fast they walk into the store, nor is the lack of a placard proof that someone is using the space inappropriately. Being human, people do sometimes simply forget to put their placard up; that doesn’t make them any less entitled to use the space. There are people who have heart conditions, or lung conditions, cystic fibrosis or other not-visible-to-the-eye conditions that limit a person’s endurance, but not necessarily how fast they can go while they can go.
As the author is so concerned with people being courteous and thinking of others, perhaps she should consider that the essence of courtesy begins with not assuming selfishness or thoughtlessness on the part of others, and she could stop letting frustration over her particular situation turn into anger at a particular person about whom she has no knowledge.