While I personally believe that they are entitled to and if they really want to, have all the right to build the mosque there, it seems to me as if they're trying to "force" tolerance on people.
Don't get me wrong, again, I support the initiative and am not against it, but it's not like the other side is completely wrong either. They're building a very large Islamic community center relatively close to where the 9/11 attacks happened.
I think both sides should compromise; the anti-mosque crowd should accept a mosque near the area, while the pro-mosque crowd should be open to moving it to a less contentious property. Yes, religious tolerance is important, but you're not going to win hearts and minds by shoving this down what (at this point) seems to be half the country - you'll probably do a lot more harm than good in the end.
In the end, I guess my biggest problem with this whole thing is it's an example of how my country has practically split in two; on the one side, we have the who just basically say "lol idiots of course they can build it the Constitution says so and it's open and shut so stop being stupid backwards rednecks!" and the other side who basically says "**** you you children killers you killed thousands of us so get the **** out" - and there is almost no one in the middle going "Guys, guys - you both have legitimate points. Let's talk this over". This entire country and this entire debate have devolved into "I want it all or else" - for BOTH sides. Everyone needs to seriously take a step back and realize that maybe the other side might actually have something to say.