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You would have to convince all the Apple fanatics to quit buying Apple products because of things like this. And the masses will keep buying, so there is no reason for companies to do things honestly.
I am amazed no one has listed Minecraft as a testament to modding helping a game grow. It's one of the top selling PC games of all time http://en.wikipedia.org/wiki/List_of_best-selling_PC_video_games and modding is almost an integral part of the Minecraft community.
Handling this right would have been to set up a DNS server that redirected them to a page telling them their computer was infected by malware and with instructions on how to remove it.
Congress does it every year with tax law, bills are often passed in late December or even early January that apply to the prior tax year. They have been getting away with it for a long time, why would they stop now?