How far down the supply chain should the due diligence go? Clearly people think it’s evil to have bought a product from a company that sources some of its parts from places run by people with bad politics. How many removes away does it stop? - what if the suppliers one link away are all clean, but the ones further along have issues?
Also, what’s special here that isn’t true of, say, the decision to use parts made in China? The Chinese government is nasty to all the same groups of people. Does the evil taint not propagate in a similar manner? Why not?