Tony designed him not to kill, but the design had a flaw. AKA an accident. The Iron Man armor itself is more dangerous and versatile than Clor. It has had an AI, depending on the iteration. It has gone nuts and gotten violent... should he not have built it at all? The X-Men's danger room had weapons and a bit of AI to run simulations, and it ended up becoming sentient and killing a few people... should that never have been built?
It's comics. If something looks like you could fit an AI in there, it's going to go nuts and kill people.
The problem with Clor wasn't that he was powerful and his programming was flawed, it was that cloning your dead friends is in terrible taste.