>>55517010All Pokemon morality is in a fluctuating state where they can be "nicest person you will ever meet" and "twisted fucking psychopath" at will depending on what the writer feels like.
Sometimes Hypno is the creepy predator who kidnaps children and attacks people to forcefully eat their dreams, sometimes Hypno is just a goofy guy who's good at putting people to sleep.
The first appearance of Hypno in the anime was exactly that, it was a mon used to help people get some good sleep in a busy city, not malicious at all, it was only unintentionally affecting nearby stuff.