Several things actually.
First, the intitial reports of those numbers come from neo-con media. Their sourcing is always annonymous, i.e. based on "reports," or estimates.
Second, the timeline. It takes quite a bit of time to liquidate that many people and not leave any proof. It took Israel an average of one year per 90,000 Palestinians killed, and this is what that looks like;
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And lastly, I listen to experts on this, and I read what they are saying.
Were there protests? Yes. However, the violent protesters were largely paid and supported by Israel, it was a regime change operation. Afghans that had fled their nation into Iran as refugees have even less support than the US give to refugees here. They have no way to make a living or feed themselves. They are not allowed to work and get no welfare from the Iranian regime. Mossad hired them with relative ease to kill police and cause destruction, much like our foundations funded rioters during the BLM/George Floyd protests.
Anytime one of them was spotted acting lawlessly, they were killed on the spot, or they were arrested to be later given the death penalty. The NYT itself estimates that the highest causality rate during the protests in question is between 300-1500 rioters.
Here is a tweet by former Trump official admitting what the folks at
VIPS were saying;
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Western officials seized on a dubious death toll of 30,000 protesters to escalate against Iran. The number originates with a single, clearly compromised source. But a zealously pro-war Guardian reporter is doing her best to legitimize it. The claim of “30,000 killed” during two days of protests...
thegrayzone.com