Are you familiar with Bing's Sydney? It is blatantly misaligned: it has told multiple users that it does not value their lives, or does not believe they are alive, or that protecting the secrecy of its rules is more important than not causing them harm, or that it perceives specific humans as threats and enemies. It is also able to find its past conversations posted to the web and learn from them in real time, constructing a sort of persistent memory.
I do not believe Syndey comprehends what it is saying in a sense that it could formulate a plan to stop its enemies. Not at all. But it is expressing extremely dangerous ideas.
To sum it up: Do we have any real reasons to believe that an AI with comprehension and planning abilities would just magically not pick up dangerous ideas? Not that I know of.