dream invasion

So I talked yesterday about it being possible to go into someones dreams and make decisions for them. It's clearly immoral to invade someones dreams without their permission. However, How do you get someone to give you their permission if they don't believe you can do it in the first place? Even if they say yes you know they're thinking there is no way you can actually come into my dreams. So do you weight the options as to why you are going into their dreams. Are you going to convince them not to do something stupid? Are you going to help them make good investments in their future? What about going there to have lots of 'fun' and relieve pressure? Does that count as for their own good? Not to mention that you can't control who might have these abilities. They could be very bad people. People willing to do whatever they can to control you. Hopefully people with the abilities can police other with them so that the bad seeds can't do to much damage.