I haven't ever seen any evidence of "rampant" IP theft by Huawei. Every time, it's the same one Cisco case that got settled 15 years ago, unsubstantiated claims about Nortel two decades ago, and T-Mobile's "Tappy" robot. This for a massive company with over $100 billion in revenue a year. If there were actually something to the characterization, you'd think there'd be more evidence. It's a bit like defining Google solely on the basis of Oracle's case and Apple's earlier claims of Android being an iOS clone.
Samsung was embroiled in a very bitter IP dispute with Apple, in which it was found to have violated Apple's patents, essentially copying the design of the iPhone, and ordered to pay over a half a billion dollars.
Yet American companies aren't banned from doing business with Samsung, nor should they be.