If you take a look at some of the many exploits used on the internet, many of them have been created by copying-and-pasting proof of concept code distributed by security researchers. Given that anyone capable of creating a complex exploit like this would have to be pretty skilled, that completely excludes the average script kiddie.
Although releasing proof of concept code may be necessary if Intel absolutely refuse to acknowledge or fix the issue, releasing it straight away for every single malware author to use with absolutely no patch for it would be really, really irresponsible, and probably cause a significant amount of damage.
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