Get them to investigate tangible stuff.
Start with Alex Jones
www.infowars.com
Alan Watt
www.cuttingthroughthematrix.com is very good explaining how the rich formed foundations that fund non governmental organizations which form policy to politicians. All areas of life have been corrupted, education, science, biology, nutrition. All this is documented in the books the rich have written. This will loosen them up with thinking our govt system is a democracy, how badly the manipulation is and that we actually have choice.
Look into Depleted Uranium and the use of nuclear energy. LEUREN MORET explains in very good detail how they have poisend the earth and change our dna. This will loosen the grip of scientist that they know nuclear energy is safe and the militarys grip that they are moral.
Aspartme and fluoride. This will loosen the grip that the FDA and EPA are looking out for our best interest.
Foreign Policy by the USA. A great video is what ive learned about the us foreign policy. This will loosen the grips that we come in peace but develop the truth that we infiltrate, murder and destroy culture
The century of self is a good video on how propaganda really works. Edward Bernays and all the big boys back then using mind control to shape our minds and culture. This will loosen the grip of mainstrain propaganda programming. You must get rid of your tv to really loosen the effects.
Research MK Ultra and the CIA and project paperclip and how our top psychiatrists like Emerson were the presidents of psychiatric foundations influencing the practice of psychiatry. This will hopefully exhibit the depth of pathology running our system.
Money Masters is a good video. It will loosen the bind that our money system is good and capitalistic. When that could be farthest from the truth.
Learn about psychopaths. There is an infestation of them and they cannot feel. The system breeds them and they are usually the ones on top of the corporate ladder because that is where they fit in.
Thats some stuff off the top of my head. I would personally stay away from any estoeric stuff for now because it can be lost in translation and is hard to define. You will get there eventually when you realize you are in a matrix.
Good luck and Godspeed soilder.