That's pretty much it, yeah.
Vulcan emotions are much rawer and more dangerous than human ones. Back in the pre-Surak times, Vulcans were extremely violent - much worse than any era in human history (IIRC, at its worst time, there was no more than 10% of the Vulcan population which was NOT at war). So that's why Vulcans embraced the system of logic and emotional control which Surak proposed - they HAD to, in order for the species to survive.
And it's why Vulcans still have to struggle every day to suppress their emotions. If they let it out, they'd die.