Re: The real reasons
I honestly don't know how much of this is A) a genuine concern that Huawei's products are actual security/espionage risks and B) let's stick it to China as a part of the Trump Administration's efforts to get China to reform it's trade policies.
I can accept that the risk that there may be a backdoor in Huawei gear is a monumentally serious downside, and that it is hard to completely ignore that possibility in this post-Snowden age. However, when you consider the commercial motives for the U.S. to go after Huawei, then the whole thing turns into this important-yet-shabby exercise.