I agree with Tom. Also, with the homeport development supposedly finally starting soon...they're gonna need all the help they can get to that place, specially since there's gonna be a lot of residential. 161/81 is 3rd due there. 242 wouldn't be far behind if something hits oh...i dunno, 2 alarms? which has been happening frighteningly more here. 157 is close to Fresh Kills which is scheduled to be a brand new park, one that will trump Central Park in size. Since parks here on Staten Island seem to catch fire every 30 minutes, we'd need all the help we can get over there, specially since the average Great Kills fire is 3 alarms. Let's also not forget the fact that as Brooklyn and Queens become more like Manhattan, what with Atlantic Yards and Willets Point pushing people out, a lot of those people will come to Staten Island, which is seen as far more suburban and homey. More people leads to more fires, it's obvious. We don't need less, we need more.
As far as Manhattan goes...Here's a hypothetical scenario for you. Fire breaks out at the South Street Seaport one busy friday afternoon. E6 is at the rock for training, E7, 10 and 15 are at a gas leak. E55 is stuck in traffic. By that point, the fire grows, gets a lot bigger then it should have, and by the time the first units arrive, it's already 3 alarms, and people have died. Since the seaport is right on the water, the sea breeze fans the flames, the fire quickly gets bigger, takes out more buildings and more people. By this point, you have lost people, and if you look at it from a political/mosey standpoint, you lose South Street seaport, currently one of the biggest tourist draws in the city. With that gone, theres no where really for tourists to go to spend money downtown, except Ground Zero, which is currently a huge construction site. You put more people in there, you get more potential for accidents and more legal trouble and so on and so on...