Some are smart psycopaths. The issue isn't dumb in power but dumb people voting. People get outraged by price gouging so populists create laws against it. Even though those laws don't make economic sense they make political sense.

Most of the time IMO state agents will just ignore price gouging because they know it is a necessary evil but if the need arises they can always intervene in prices, say they are doing something and save face. But this destroys the economy if done often. It's not black and white.