I agree with some of the points, but I have to say, they're not making it easy for me to agree.
The memorial should, ideally, be apolitical. I'm not sure how possible that actually is, though, especially with people so ready to attach political motives to anything they don't like.
I also doubt it would be possible to come up with a memorial that would satisfy everyone.
I would like to see more space and thought devoted to 9/11 itself, rather than this more conceptual and indirect take on things.
I don't think, however, that it's wrong to have a secondary exhibit about the lessons to be learned.
So, I don't agree with the current focus, and I do think it could be done better. OTOH, I think the objectors could do a better job, too. It's hard for me to side with them when, despite claiming to be apolitical, they repeatedly attack liberals. "With apologies to our blue friends?" If you need to apologize in advance, maybe that's a sign that you shouldn't say it in the first place?
The second article you linked to (and which is prominently linked off the first one's homepage) is even worse. It lumps all liberals together in one pot, makes hyperbolic claims about their stances, and seems to imply that anyone who disagrees with the government, even about contravertial issues (issues which, BTW, have no real place in this discussion), should have all their opinions discounted.
Similarly, I don't see what the ACLU (or "their cronies") have to do with anything.
The memorial should be apolitical. It should be a monument to the tragedy, the lost lives, and the heroes. Taking time out on the side to promote thought and discussion about the lessons to be learned (to help prevent similar tragedies in the future) is not necessarily a bad thing, but it shouldn't be the main focus.
Attacking liberals, however, is not a good, productive, or apolitical way of making that case.
"Killing masses of innocent people is wrong" is not a political message. "9/11 isn't the only time when masses of innocent people were killed" is not a political message. "At one point in our history, our ancestors killed masses of innocent people, and that was wrong, too" is not a political message, nor does it in any way imply that the 9/11 attacks were justifiable.
Now, whether or not those messages should be included in the memorial is debatable, but the debate will go a lot better if we all leave politics (and our feelings about people with differing political views) outside.
Paul