Should you be worried that other people are going to take the ideas in the Action Principles® Plan and take all of the best opportunities away from you? No.
First, most people aren't going to do the hard work or the research.
Second, very few of the people who do the hard work and the research are going to invest the money. Third, it doesn't matter. Wish them luck, because there are too many opportunities and possibilities in any investment area for any individual or even any group of individuals.
There is nothing wrong with advisers presenting contrary ideas if those cautionary words are backed by rational thought. You don't need sycophant "Yes Men" around you who are more interested in collecting their fees and really don't care about your success. Yes, you want people to feel that they can voice an opinion. However, you don't want to surround yourself with average advisers who are against real estate investing, who don't have faith in your abilities and are generally pessimistic people.
Through their own fault or no fault of their own, there are those who feel defeated by life and you won't have to look far to find them. How or why others fail is not your business. You are not a social worker or a psychological counselor. You can't change these people; you can only change your reaction to them.