Sometimes, Conspiracy threads (especially) morph into Mainstream. Example - if Watergate were to happen now, the first, tiniest inklings would easily be in Conspiracy, but the aftermath, when all was laid bare in forensic detail could equally be classed as both Conspiracy and Mainstream: the former as it was.. erm... a conspiracy, the latter because we then knew the details.
When things are still unspooling I think it's safest to remain in Conspiracy, especially where there are myriad angles that just don't add up. When it's entirely straightforward (granted there are those that will never accept straightforward) then it should be in Mainstream. If all else fails it's no hardship to shift it.
Iran, for the moment, has so much murk going on that it's placed correctly. As for the potential actors - we know about Trump, we know about Israel, we know about Saudi. In the context of this thread, we're only interested in their direct relationship to this thread. Please let us keep to that,