The climax of the comic was all about keeping the horrific secret. I don't see Veidt boasting to the future president...or if he did, not doing so by laying it all out in a recording that anyone could watch.
I think what we were being told was that Veidt so thought he was home free that what happened in the past wouldn't matter and in fact, he would be hailed as a hero. I know I was surprised when Laurie pulled him up short. In fact, I thought she was kidding at first. I also think there'd have been a sizable outcry from fans about allowing him to walk after killing 3 million people would have been pretty significant.
Overall, I thought all of the storylines were wrapped up pretty efficiently and satisfactorily. I'm a big fan of Lady Trieu and the actor who played her. I thought the character was really interestingly written and acted. It seemed like nothing she said, or the way she said it, was predictable. So I was pretty pleased with her role in the finale. But I wish she had lied.
I loved her, "that motherf-----!" I did guess that her and Will's plan was to take Dr. Manhattan's powers so that 7K couldn't get them, but Lady Trieu's obsession with the power was a surprise.
I also liked that Lady Trieu didn't beat around the bush when it came to her plan to finally eliminate 7K. I wanted to hear the rest of her speech. And yes, the Senator Keene as a pool of goo was pretty funny. Especially when Lady Trieu let it be known what a first class dummy the guy was.
There was talk around the internet about Jon maybe putting his atomic essence into the pool, or the eggs, of even the waffles. Having it be the egg made sense (if that's what happened) given what we saw in the bar scene with Angela. I just knew we wouldn't see her walk on water, though. That seemed a bit cheesey to me. So I wasn't surprised that the episode ended with her foot over the water.
Maybe there was some moral ambiguity in the end tied up with Angela's decision to eat the egg. We had been told by Veidt and Jon as well, I think, that seeking his power was a pretty good indication that you shouldn't have it.
I hope we get a second season. I;d like to see more of the world Lindeloff created. But if it does happen, I don't think there is any way we'll get all of Regina King, Louis Gossett, and Jeremy Irons back. That's just too much star power to hope for again.