There were already something like 7,000 UN personnel there doing peacekeeping and support, of course to some extent they are now victims as well since I gather their barracks were heavily damaged and no doubt some number of them killed and injured too.
As Deb mentioned, the Chinese delivered an aircraft load of supplies as well, and no doubt much is on the way from other sources besides us. But let's be fair here, for this kind of emergency, massive help is required immediately to save lives, i.e. any rescue efforts with heavy equipment and labor to extract survivors has to be in the first 72 hours, getting anyone out alive after that is a miracle. We are the only people in a position to do that, and it would be morally wrong to shirk or stint it.
The infrastructure to deliver necessities like water, power, and sewage (Where services existed) is pretty much destroyed in at least Port-au-Prince, it is going to be a huge challenge to provide life support for the survivors now and in the coming weeks while that infrastructure is patched back together and brought on line again. And you can't take a deliberate and carefully-planned approach to delivering drinking water or emergency rations to a million victims of a disaster, you pretty much have to throw resources at it until you can get the situation stabilized enough for a deliberate planning process to take over control.
