I believe the fundamental problem with Ripperger is that his intellect has been corrupted. He holds simultaneous contradictories in his mind.
His own words - not his voluminous quotes - but his own ideas and assertions, reveal a mind that is habituated to violations of the first principles of reason. Such intellectual degradation is the necessary effect when one simultaneously plays tradman and works assiduously to prop up the novus ordo imposture. You cannot hold both that the Catholic Church is the Catholic Church and that the novus ordo is the Catholic Church without frying your rational circuitry.
Ripperger's mind might be likened to a duality (schizoid). One track runs along the truth, especially through the prism of St. Thomas. The other track runs along the novus ordo falsity. These tracks seem to run parallel to each other, so that his intellect is never alerted to the violation of the first principles.
You ask yourself how he can be both so good and so bad at the same time. Maybe this explains it.
I think where he is his very best, is in his book on mental health, which is almost entirely the epistemology of St. Thomas. I'm studying it right now and it is doing me a world of good.
First of all, it is reintroducing into my own mind a large body of knowledge I first received by studying the Summa. Because I've already learned from St. Thomas, and because I recognize St. Thomas in Ripperger's work, I am able to benefit from what Ripperger does best - collate, organize, and summarize principles.
Secondly, this book satisfies a great societal need for a rational dismantling of fake jew pscholatry. One of the primary vectors by which neo-paganism entered into the culture is "modern psychology." This has mutilated and destroyed minds, bodies, and souls with pretty much the same efficiency as Vatican II. In fact, did not the VII apparatus destroy the vocations of countless religious by delivering them over to "psychoanalysts?"
In his book on true psychology, Ripperger presents to the world the literal antidote to this poison. Besides Christ and the Church, mankind needs this knowledge more than anything else.
I don't take the approach of categorically refusing to peruse the works of certain novus ordo operatives, on the sole basis of their being novus ordo. Some of them provide "victuals" here and there that are edible and even nourishing, provided one makes certain not to swallow the bones.
The vast majority of thinkers on this forum graze in the pastures of men like Ripperger; and that is a good thing. It's good to point out their errors, and it is good to point out the good they do.
Every single comment about the demonology niche Ripperger has carved out for himself is accurate and well taken. In fact, how do we know that he wasn't dragged into this fake exorcism ministry precisely because he is Thomistic and this would be a great way to make inroads into his mind. Or perhaps it's a great way to ever more firmly attach him to the novus ordo. He is human, and so he is susceptible to all manner of temptations that come with fame and notoriety. His prior compromise with VII had already unmoored him. This deliverance ministry BS might take him down in the end.
As I do consider him a benefactor of sorts, I pray for him. Wouldn't he be just grand if he finally unified and purified his intellect?