Is their a law to restrict or punish this kind malicious litigation?

NJRS §45:15-16.46(b) Any person who violates any provision of this act or any person who, in an application for registration filed with the commission, makes any untrue statement of a material fact or omits to state a material fact shall be fined not less than $250, nor more than $50,000, per violation.

Do you have another way to minimize exposure to bad actors?  

Their "record" would never stand up to anything resembling investigation2- Half the gurus are not real estate people at all; they are unsuccessful actors fronting for a seminar company.3- The basics of successful investing in real estate have not changed in one hundred years.4- Learning, understanding, and experiencing the basics of real estate finance, real estate law, and property management will provide the foundation for a successful investing career.  

The reason we have those statutes is because of bad actors. 

Follow the law.If you want to be an *** hat LL, the legislature will react and your bad actors will be the cause of further regulations. 

I asked the guy next to me how many of them he thought were paid actors?

The problem is that there are no limits on how many short-term rentals a single property owner can operate, he said.In some Arizona cities, Drennon said, “bad actors” are buying and converting entire apartment buildings into Airbnb rentals, effectively creating hotels in residential areas and depleting local supplies of rental housing.By contrast, traditional hotels typically operate in commercial areas that have much higher property tax rates.Many cities around the world — from Paris to New York City and even Airbnb’s home city of San Francisco — have laws that limit short-term rentals to protect the hotel industry and residential neighborhoods.

He sold the business to someone else and I've heard they use actors as their speakers and it's a hard up-sell to attend one of their bigger, more expensive seminars where there is a hard up-sell to sign up for private coaching.All the courses I've looked into are "gurus" trying to up-sell.

I feel like this is something that may happen to me, always assume people have the best interest for me, when in fact they may be malicious.