I don't know about Darren Wilson. My suspicions aren't relevant.
Here are some quotes from people who gave him money after the fact:
"Waste of good ammo"
"He did a great job removing an unnecessary thing from the public"
"Wake up white america"
"After 60 years of supporting the blacks I give up"
"One down many more to go"
And that's just a sampling from what was reported on news sites, since the campaign itself was taken down (by the originators, not by GoFundMe itself.)