Price controls also often create black markets, adding a criminal dynamic to an already bad situation. Locally high prices may increase outside sympathy for the disaster victims. Anger at the price gougers may inspire additional donations of supplies to deprive them of their outrageous profits. The merchants may also be victims however and those extra profits might be the only thing that makes it possible for them to rebuild their businesses. So although it is easy to condemn price gouging as cruel and greedy, it may not be in the best interests of the disaster victims to try to suppress it.
Disasters are human drama and the suffering of the victims is dramatic.
The beneficial effects are much harder to observe and describe than the anger and frustration of the disaster victims.