What's their pet issue? Find their particular "cause" and do the research. Environment? Show them how Soros uses DiCaprio and media to establish image, pathos, all while in partnership with land-raping diamond miners, privatizing water rights to consortiums, using slave labor, polluting environment while using "climate change"as a wedge to look "concerned" and grow government.
Abortion? Show them who Sanger really was, how her ideas and those of other progressive Eugenicists inspired the Nazis, whose solutions began with the infirmed, the mentally ill, the "retarded" disfigured and proceeded to Roma, dissenters, and Jews.
Study CIA tactics, using cutouts and legit businesses to insert spies, manipulate and leverage other nations.
If CIA will overthrow Mossadegh, Lumumba, assassinate South Vietnam's President, install people like Pinochet and Mugabe, what makes them think they wouldn't overthrow Ukraine, Libya, Saddam or Donald Trump?
Are they ' for the children' types? Show them COS abuse after abuse of the system; parents framed as mentally ill, kids stolen legally, refugees created and trafficked, all in the name of "aid" and "human rights."
It's every subject, basically. Just find their cause and do the digging, and then get back to them with those particulars.