His explanatory approaches, especially to the terrorist attacks of 11 September 2001, to the assassination of John F. Kennedy and to Julian Assange are classified as conspiracy theories.

In several publications, Bröcker devoted himself to educating people about this ancient cultivated plant and also its criminalization and pathologization of consumers by the U.S. media czar Randolph Hearst in the 1930s.

Bröckers and Böttcher published them under the pseudonym John S. Cooper, for which they invented and maintained over several years a biography as an American author who came to writing late in life.

The authors attempt to prove that geostrategic interests are the driving force behind the Russo-Ukrainian war and that regime change has been organized.

[10] With his "WTC Conspiracy" series at the online magazine Telepolis, Bröckers became known to a wider audience and achieved high circulation with his subsequent book Verschwörungen, Verschwörungstheorien und die Geheimnisse des 11.9. published by Zweitausendeins.

In Bröckers opinion, only George W. Bush and Ariel Sharon come into question as the main suspects of this attack, as they would have made the most use of it for their politics.

Bröckers was sharply criticized for this contribution and accused of shoddy research due to the reproduction of outdated or false arguments.

[11] The Berlin historian Wolfgang Wippermann spoke of "anti-Semitism pure and simple", since Bröckers, with the question about the cui bono, Ariel Sharon, Israel and the Jews in general, which is just typical for conspiracy ideological thinking, declared them to be the main profiteers.

[12] The journalist Tobias Jaecker accused Bröckers of supporting anti-Semitic conspiracy theories in the wake of the Protocols of the Elders of Zion.

[13] In addition, Jaecker notes that Bröckers deals with the subject ironically and less doggedly than other representatives of conspiracy theories, "there you always don't know exactly: does he really believe that now or is he actually just making fun of it.

Bröckers stated that the unanimous opinion expressed by the media that Bin Laden was responsible made him suspicious: "Although it was the biggest police investigation of all time... one year after the attacks the amount of evidence gathered against those who allegedly masterminded them, Osama Bin Laden and his terrorist group Al Qaeda, comes to no more than it did only a few hours afterwards: virtually nothing.

According to this, he professes a conscious rejection of established media as the basis of journalistic research: he sees these as mere consensus machines and tending to corrupt.

Seidler explains the fierce attacks on his theses with the fact that Bröckers, unlike other conspiracy theorists, appears recognizably as a professional journalist and publishes in a thoroughly reputable environment.

[17] In 2017, Bröckers judged in the online magazine Rubikon that the behavior of the CIA and the media against President Trump were clear indications of a "deep state" "which is conducting a coup from within by undemocratic means...".

He called on the "serious left" to overcome the "cognitive dissonance" that compels them, for example, using the assassination of Kennedy as an example, to question what he sees as the improbability of Oswald's perpetration or to consider the official account of 9/11 indiscernible.

[citation needed] In 1993 he co-authored the influential Die Wiederentdeckung der Nutzpflanze Hanf (The Rediscovery of the Agricultural Crop Hemp) with Jack Herer.

"He described the free choice of stimulants and intoxicants as human rights, the duty of states was accordingly "to guarantee the supply and to teach people the responsible use of these means".

The belief in the effectiveness of repressive drug policies was disproved (WHO 1971, UN study 1997, Paul Flynn's report to the Council of Europe 2002).