Why not? Palpatine is not a nice uncle. He is a Sith Lord for God's sake! With his final revelation, there is nothing more to hide.

In the original cut, he is a nice uncle at this point. But, a few hours later, he kills Jedi without any problems, gives order 66 and convert republic into galactic empire. This totally contradicts his character. Of course, you would say he was doing that to manipulate Anakin, so there is no contradiction in his character. The problem is, it makes Anakin dumb as wood. There is a Sith Lord standing before him, who has killed millions of people and he believe's that he is ok? How naive you have to be? This is exactly unbelievable like when Palpatine kills Windu and tells Anakin, that he does not have the power to save Padme. Of course Anakin does nothing and accept that, being a five year old naive child.