If MS have found a compromise they should share it. Making the allegation but not disclosing any reason is just slander.
In this case I also expect it's all very carefully worded ("Be careful! This site might be trying to harm your computer") to be legal even in cases when they accidentally (and inevitably) miscategorize a site.
Depends on jurisdiction, although I am presuming OP is from the USA due to their spelling.
In court and parliament, this is relaxed somewhat. But just 'cause you - say - saw a murder by X in broad daylight, doesn't mean you get to say you did anywhere you like, in Canada and Britain.
PS, yes defence is really spelled with a c in Canada. This was deliberately done historically in order to distinguish ourselves from the US long before the internet and spell-checkers.
IANAL - but then a lot of lawyers aren't much good at their game either.