It's very much a case of the "being seen to do something" syndrome going on.
If the authorities don't do anything to the club after a racist incident, then they "don't care" etc etc, so they do what they know how to do, dish out a punitive action to a club that has already investigated, found the culprit and taken action against them. It serves no purpose other than to protect themselves from criticism. What Wednesday have done is likely to be far more effective in preventing further outbursts & they should have been praised for doing it.
But imagine if they'd come out and said " no football club can be held responsible for the garbage that comes out of the mouth of one dickhead supporter but in dealing with said dickhead swiftly and effectively SWFC have laid down a marker and we fully support and commend their actions". It's the statement they should have put out, but they'd have been set upon by all and sundry if they had.