It is worth remembering that after Hurricane Katrina we received nearly $1 billion in donations, aid, consumer goods, and petroleum relief from countries around the world. Sure some offers from the likes of Cuba and Venezuala were publicity stunts, but by and large the outpouring was sincere and global. On a purely humanitarian basis when we needed help we received it without question, likewise when others are imperiled by the unpredictability of mother nature we should not debate our willingness to lend a hand. It is in my view the crux of civilized human society and a shining example of our best as a species.
Edit: Pointedly many, many other countries have stepped in to help. The British have dispatched a small maritime task force to help in the relief efforts, Malaysia is promising to send its Globemasters to assist in ferrying supplies, Russia offered a rescue time, and other plans are being analyzed.