I think all emotional states can be triggered electrochemichally for arbitrary durations.

The reason all humans aren't like the manic people mentioned in the article is that it's not an evolutionary stable strategy. They hoard, steal, flirt too much and cooperation cannot happen.

Which brings me to a scary question - what stops a future radical extremist from capturing enemies and triggering the most extreme pain that no one has ever felt before with electrodes? Or gene editing millions of babies to be in constant extreme pain for their whole lifetime, without limbs or senses to be able to change anything (inspired by Metallica - One)?