Apostrophes are abused, regularly, with no regard for how they might feel about it. Here’s a good example, and a snappy four-liner about plurals:
Lots of things are plural.
To show there’s only one,
You only need to add an ‘s’.
Apostrophe, be gone!
There should indeed be an apostrophe in DONT’S, but it belongs between N and T to show there’s an O missing. I feel sorry for it.
For a poem on this subject, which is very dear to my heart, please listen to On Behalf Of Apostrophes.