Human cloning, which is likely one day, is worrying. Even if it is intended for the best of reasons, in the wrong hands it would be catastrophic. Hitler, for instance, would probably have been thrilled to have clones of himself and like minded psychos.
Why would a cloned person necessarily think like the person from which they were cloned.
Likely they would be brought up years later and in a different environment. I think you are over-egging 'nature' and under-egging 'nurture'. Even our natural clones (identical twins) who are normally brought up in the same environment and, of course, at the same time aren't identical in terms of their thoughts, desires etc.
You mention Hitler - he never had the technology to clone, but he recognised a much more powerful force (one recognised by autocrats over the centuries) - that of indoctrination. If you want people to think and act like you, control their upbringing and education. That's going to far more likely to succeed than cloning.