If people were more considerate of others and less self-centered, we would not need many of the laws that are on the books.
You can't legislate politeness, so lawmakers have to legislate such things as not parking in designated handicapped spots without a properly displayed permit. Laws against littering and playing loud music also step in where common courtesy is absent.
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But because police can't be everywhere, courtesy and gentle reminders from others are still important.
It is particularly puzzling why someone with a handicapped placard for a member of the family would misuse the permit and park in a designated spot when the disabled person isn't with them. Of all people, someone with a handicapped loved one should understand the need to keep spaces available for those who truly need them.