Now I can't do that calculation, but if that probability is infinitesimally small, you should consider the possibility that Przewodow was deliberately targeted
I don't understand.
Russia has been firing hundreds of missiles, including S300s, cruise missiles, drones and anything else at non-military and infrastructure targets throughout Ukraine for the past month, including one would presume, some near the Polish border.
Ukraine has an assortment of anti-missile countermeasures, including older Soviet era S300s, that are fired in response to the Russian barrages.
It doesn't seem odd that at least one of these old S300s might drift off course and end up in Poland, unfortunately striking near a tractor.
How, and why would either side target a Polish tractor?
How: While a Surface to Air (SA) missile designed to hit aircraft, like the old S300, can be lobbed at ground targets like a power plant, can they be successfully guided to something like a tractor on the ground? Doesn't seem likely, but I'll let other more knowledgably folks weigh in.
If the S300 is incapable of targeting something like a tractor
even though the Przewodow area
was targeted, then it was just an unfortunate incident that the tractor was hit. In that case it would be indistinguishable from a stray missile striking a tractor.
Why: What is served by targeting and striking 2 Polish guys on a tractor? Russia would do it just to get NATO more excited and involved? Though Putin is sometimes hard to predict, anything that increases NATO involvement seems counterproductive.
Ukraine purposely targeted Poland in a false flag operation to drag Poland further into the conflict? Poland is already one of Ukraine's biggest supporters, and a false flag operation is very risky.
Giving the number of missiles flying around in that area and the number targeting non-military areas throughout Ukraine, an unfortunate accident seems completely plausible.