"Oh, dear, this might increase the likelihood of New York being attacked!" So goes the prissy whining (which is really just partisan attacking) from right-wingers like Rudy "9/11" Giuliani and Sarah Palin regarding President Obama and AG Eric Holder's decision to transfer a group of men from Gitmo to NYC to stand trail for their involvement in the 9/11 attacks.
The only way for NYC to lessen its likelihood of being attacked—which is high 24/7—would be if we seceded from the United States or became completely financially irrelevant to the U.S. overnight. And if we got rid of all the Jews. Those things aren't happening, nor should they, so...so much for making us likely to be attacked.
Other complaints are that a trial would cost too much or provide al-Qaida a means by which to advertise its brand of extremism or might end with all of them walking free. Would those arguments hold in any other case? No. Our justice system—which is part of why the U.S. is such a great place and is so despised by tyrants and religious terrorists—is unique, it's what makes our country worth fighting for.
I was here in NYC on 9/11 and watched the towers burn and the second tower fall. I say bring 'em on. We'll lock them up forever or send them to their deaths in the city they wounded but failed to terrorize.