Dart, it hasn't been my experience that atheists are any less likely to ask whys and be philosophical than theists.
Oh really?
Then please point me to any discussions among atheists where the questions:
"Why are we here?"
"What is the purpose to life?"
"How did the universe come to be?"
... are being hashed out in a philosophical manner. I can't even imagine such a "discussion" going beyond, "well, science doesn't say so who am I to speculate?"
These questions naturally gnaw at the iconsciences of most humans, but from my experience atheists aren't interested in them because they go beyond what science can answer. They're afraid that going beyond science might lead to some kind of religion, and they have built up defense mechanisms against this. So the result is a boring, uninteresting, and sometimes an anti-social being who is more interested in attacking religion than anything else.
Take for instance, EAllusion. The dude is smart as all get out, but when does he ever show up?
Only when he has something to say against ID or against someone else who tries to justify their own faith. That's it. Nothing else seems to interest him.