[8] In 2020, Kärrholm published the book Gangstervåld (Gangster Violence) documenting the rise of violent crime in Sweden within the past few years which he followed up with an article in Dagens Nyheter about the need for tougher prison sentences.

[9] In 2024, he published Lag & Ordning (Law & Order) in which Kärrholm attempts to take a holistic approach to crime with causal analyses, measures and balancing of interests, with a liberal conservative starting point.

[13] Following the October 7 Hamas attacks, Kärrholm claimed that Social Democratic Party member of parliament Jamal El-Haj was a security risk and had connections to Hamas and urged Social Democratic leader Magdalena Andersson to expel him from the party during an interview with Svenska Dagbladet and posts on Twitter.

[15] In a counter-article, Kärrholm declined to apologize and maintained that El-Haj was unsuitable as a member of parliament and a security risk due to his alleged connections with Islamist groups.

[16] In 2024, El-Haj was subsequently expelled from the Social Democrats after using his position in parliament to secretly block the deportation of an extremist imam to Egypt.