People will act according to what they believe. In other words, their behaviours are caused by their beliefs.
There is a NLP Presupposition – “No one does anything inappropriate given the model of their world”. And their model is based on what they believe.
For eg, it is a hot day at 34 degree celcius. But you are having a cold and you are shivering a bit. If I tell you it is so hot, your reality (the fact that you are shivering) would convince you that it is not a warm day. What occurs in your reality is what causes your belief, even the truth is it is a hot day at 34 degrees.
Similarly, if someone believes that hypnosis is fake or is some mind control method, they would not trust hypnosis.
Changes made at the belief level will affect how people view hypnosis or anything.