I get wanting to save a loved one, I get his frustration with the council, but really Anakin? Betraying not only your friends/coworkers but innocent kids too? He's deranged and heartless and I really wanted to get that across, but that he's tormented as well by what he's doing, even though he believes it's necessary (even if it is for but a moment.)
In a way, it was necessary. He had to bring balance to the Force. He had already brought the Light Side to power, but he had to bring it down. He did the same with the Dark Side: raising an Empire, killing countless Jedi (including Obi-Wan). And how he brought the Dark Side down was by saving his son and literally overthrowing Darth Sidious.
With that, both sides of the Force were free to start anew. And it all started with his son, Luke.