I know what 'baking internally' feels like; I have hot flashes! I've often felt like tearing off my clothes and lying on a block of ice nekkid in front of a fan!
Yes, this guy was obviously under the influence of something extremely potent, but it's also been stated that he didn't have the best mental state to start with. Mental disorder + drugs = crazy and dangerous.
However, that doesn't mean we need to barricade ourselves and loved ones in our homes, and act as if the Apocalypse is upon us. Being smart, taking precautions, and living our lives is the only way to go. If I had the mindset that every time I left the house something horrible was going to happen to me, I'd be an emotional wreck. Bad stuff happens all the time. Doesn't mean we have to live in fear and give in to hysteria and hyperbole.