This view, that emotion and reason are detached and at odds, is bunk. Rational action is impossible without emotions; emotion is the first step in the process of thinking. If it is also the last step, then yes, that can lead to problems, but such problems loom just as large when we negate its role in favor of "cold rationality."
An experiment by Critchley tied the ability to feel empathy to the ability to sense one's own physical state: people who were better at feeling their hearts beating also rated highly on an empathy questionnaire. Which makes sense: the more attuned you are to your own feelings (and Moriguchi shows that physical and emotional feelings share a highly similar brainprint) the more attuned you automatically are to those of others. People who deny their own feelings, it follows, are less caring toward others. Wisdom has also been tied to reflection and introspection, which leads one to wonder whom you would rather have as a key decision maker in your life --a doctor, say-- someone who acknowledges their own feelings or someone in denial?
The problem with Bloom's thesis is that we always try and act rationally. The people in charge of distributing funds to Haiti were probably more aware than most of the attendant difficulties, and did their best, but there were forces at work -- warlords, profiteers, corrupt government officials, and such -- well beyond their control. Would less empathy on their part, perhaps leading them to shrug and say we may as well not try, do any good? Is the latter the rational response? No. We experience empathic feelings which leads to a desire to help, and a rational response, such as sending stuffed animals for the kids, is not to be belittled because of logistics. It should still be our aim to increase our ability to feel empathy, for without that we have girls committing suicide because they posted a video of their suffering and received only mockery in return.
It's easy to cite negative examples on both ends. The wise course is not to pit empathy and reason against each other, but to work against corruption and greed, forces whose very lack of empathy, and therefore reason, is the source of their utter destructiveness.