Oh, they are really. I used to like to sell the juveniles in an aquarium shop I had decades ago because they were lively, attractive, intelligent for a fish, and resistant to the nitrogen cycle run-in for a new setup before nitrifying bacteria were established. They're not known to be aggressive in tanks or the wild, considered planktivorous eaters, also known to eat krill, clams, squid, urchins, and small fish, but not ferocious killers. It's wrong to release them in coastal waters when they get big, but surely happens.
One time early in my diving days I took a ziplock of cat food with me to Belize and opened it to see what fish I could attract. Dumb thing I did once. I was amazed at how many triggers suddenly surrounded me. Should have used frozen spinach, but I never repeated.