First off, Psicorps isn’t the one responsible for creating the system of ‘join us or we’ll make your life so miserable you’ll wish you were dead’. Earthgov created the predecessor organization to psicorps and the laws where telepaths have to choose blocker drugs, blocker drugs plus prison, or joining the organization. It later became Psicorps, and even later the telepaths took it over, but they weren’t the ones who came up with idea and laws for it.
The bulk of the information about the creation of Psi-Corps and the treatment of telepaths is in the first novel of the Psi-Corps trilogy. Early in the book, a medical journal publishes an article showing that telepathy exists, and when the article gets big media attention there are more than a hundred attacks on alleged telepaths within an hour. Then the first part of the book opens with some vignettes of telepaths being murdered (one a kid’s mother trying to escape hunters, another as part of a group being thrown into a mass grave and shot), and on page 31 has a character reference events by saying “How can I feel vindicated by the deaths of more than ten thousand people? The massacre Wednesday in Shanxi? The bombing in Utah? The rioting in Chicago - the spacings in Armstrong?”, then two pages later the other character in the conversation says “People won’t stop killing telepaths - and people they suspect of being telepaths - until they stop feeling threatened by them. That won’t happen without regulation.” (Dark Genesis: Birth of the Psi Corps is the book).
Also there’s the main series plot where a large, influential corporation headed by a man (William Edgars) who is one of the ‘powers behind the throne’ of Earth Alliance develops a virus that will target and kill telepaths unless they receive regular injections of an antidote that they’re also developing. He states that he does so because he believes there will be a war between normal telpaths and that he wants to either control them or wipe them out. He also, just to demonstrate how he feels about them, uses a telepath to scan Garibaldi to see if he’s lying then kills the telepath when they’re done, and uses telepaths as human test subjects for the virus and cure. He even accidentally refers to what he’s doing as the solution to “the telepath problem”, a deliberate reference to the Nazi solution to “the Jewish problem”. (Season IV, episodes 12, 14, 16, and 17)
So even though Cafe Society doesn’t usually do much with cites, there’s a few for you. There’s more that a vaguely remember, but it’s been like 15 years since my last watch of the series so I can’t quickly find specifics. IIRC the treatment of the shadow experiment telepaths stored in pods and some of the stuff around Byron and his death cult provide support for how telepaths are generally treated too.
Just look at the case of the main focus telepath. Lyta saved the station in an early episode by informing them them that they had a sleeper agent on board (Talia Winters) even though she had to come out of hiding with the Mars resistance. Later, she was the only strong human telepath Sheridan had availible to test whether the Shadow ships could be hindered by telepaths, which was very rough for her. She volunteered for a mission to find Sheridan on Zahadum. Then she scanned Ulkesh to find out what the Vorlons were planning, and helped destroy him when they decided to expel the Vorlons. She was then instrumental in ending the Earth Alliance civil war by sending a signal to all of the captured telepaths in the shadow tech ships.
And after saving the station, Sheridan, and what became the ISA multiple times, the main focus characters and the organization that’s supposed to be better than what cam before didn’t treat her like a war hero or even a valuable asset, they just cast her aside and only let her stay on the station as long as she was paying rent. And since she was a rogue telepath, which wasn’t included in the amnesty for the Earth Civil War, and the ISA or station wouldn’t hire her either, she couldn’t get any actual legitimate worth, and eventually had to accept a deal with Bester. That makes it pretty clear how little regard even the main characters have for Telepaths, when they are perfectly willing to use her and cast her aside, while remaining loyal to the non-telepaths who fought with them.