Until CNN gave Trump endless free and unedited airtime in 2015-16, no media organization came even close to boosting this career criminal as much as NBC. And NBC has never stopped bending over for him, as the sickening recent "Meet the Press" episode showed.. 

Now Trump is making what amount to death threats against NBC and its parent company. Earlier, he denounced CNN with almost equal vituperation.

Lessons learned: none, from all appearances.