Yes, I'd go to the mall. And if I didn't, it'd solely be because I'd turn back if I saw over-zealous TSA-style "security" at all entrances. That's right, I'm more afraid of the TSA (guaranteed to cause misery) than a terrorist (can only cause misery if extremely lucky.)
I lived the first 25 years of my life in a county regularly attacked by real terrorists - not cartoonish villains wearing head dresses, but the sociopathic extreme of a (rightly, in my view, but that's another story) angry Irish Catholic community. I can honestly say I never changed anything I did based upon fear of being killed by terrorists. You don't live your life that way.
In this case, Sony and various theater chains are pissing their pants over a group that has no record of terrorism and which, having "warned" us, is highly unlikely to get away with an attack anyway. And whose justification for an attack anyway is absurd and highly improbable to drive anyone into a murderous rampage.
This is the logical continuation of the Bush response to terrorism: show the entire world we're terrified and lashing out at everyone, because somehow that's helpful, moral, and not going to encourage more terror.
It's time this nation stood up, and stopped pissing its pants every time someone phones in a bomb threat.