I study psychology at a university in Europe and wrote an article with the theme "Psychology of sects and groups that use "destructive social influence" and its impact on the lives of its members."
For this article, I researched several works of experts on sects, including books by Steven Hassan, Marc Galanter, Janja Lalich & Madeleine Tobias and Margaret Singer.
This article will be published in the journal of psychology at university for its quality and research presented (including a survey).
I mention this only to show that not everyone has the same bias in relation to the writings of Steven Hassan, but we also recognize merit in their work.