There are a heck of a lot of people that abuse the blue badge.
I have one over the road from me right now, he parks his estate car blocking half the pavement with his BB in the window - so his son can get whitegoods in/out easier there is usually a washer in the back) that he repairs. This scenario is replicated all over the country in various forms.
Then there are those that are genuinely in need of one that park very ignorantly and contrary to the rules that they should follow.
i.e. I see the same BB cars every weekend, parking on the zig-zags of a zebra crossing that happens to have the pub right next to it.
This is actually for the guy thats stood behind the mic singing all evening. Others are very close too, right on the corners to side roads etc.
All for an evening in the pub.
Sounds like abusing the scheme to me.
Then there are those genuine people that need them, that need the spaces right next to the place that they are visiting - but due to someone abusing the scheme - they cannot park there.
Such is life, no matter what the scheme is - there are always those that will abuse it.
Heck, if my daughter or MIL actually got one Im sure there would be times when I'd be tempted to use it myself.