I can see your points and the points of others, but I just cannot agree on all of them. Character, the essence of who someone is, doesn't just change, and certainly not as dramatically as the Henson children are painting Steve's. A person's mental and moral qualities are the foundation from which all actions flow. And actions speak louder than words.
The Henson children acted by spitting on their father's legacy, something they knew was very important to him, selling it not once but twice to the highest bidder. Steve acted by protecting Jim's legacy and its integrity.
The Henson children acted by slandering Steve. Steve has acted with empathy, calm, and tact -- with no insults of his own slung.
So until there is something more substantial than hearsay from a morally-bankrupt corporation, greedy children disconnected entirely from The Muppets, and a couple of bitter/envious puppeteers, I decide to remain loyal to Steve Whitmire. I am loyal to the Muppet characters of course, but first and foremost I am loyal to those Muppeteers who have dedicated their lives to and have worked tirelessly to bring them to life. Loyalty, for me, isn't just a weather-vane to be moved to and fro by a fickle wind.