I know this is a vent. Sorry you feel like that, man. Keep your head up. Read this from the perspective that I've played here a long time and seen a lot of changes, problems, and people come and go. Not meaning this as a refutation at all but some perspective to help you or others.
Med is what it says on the can, a medical department. 90% of the time treatment means fixing bullet holes and popped lungs. The nature of the gameplay loop means that even on "peaceful" antag rounds someone is likely to be injured. Even on a moderately normal antag round there may be a few deaths. It's my opinion ultraviolent antag rounds are rare nowadays. As someone playing since 2016, I don't consider an antag super violent / out of the ordinary unless half the station is either bombed out, covered in blood, transformed into cult, or most of the station is fending for their lives.
However-
the role of psychologist has always been one that is different. Mechanically, they are useless. They have no gameplay loop especially since the mental disorder treatment loop was removed in the past year or two. They, like consular and some other niche roles, exist purely for roleplay flair. There's not a whole lot of mechanical capability to the role. There's even a warning on the wiki about this. It's not your duty to fix people's popped lungs or anything like that. Some basic first aid or basic drug giving is kind of expected, but these things happen. My advice here is to play the role, and learn to not care about stuff outside your lane. Warden for example is similar to this. They MUST stay in the Brig unless getting something to eat. The entire ship could be going down the shitter, half exploded and vented, but I would expect a competent Warden to remain within the Brig at all costs. What are your base duties and responsibility as psych are a grey area and up to you. Don't sweat what's outside your "brig" as psych.
A third point I think you bring up is if we indeed have a problem. Of course we have a problem. There's always problems in SS13, Aurora, The Community, and gameplay itself. There always will be a problem. The gameplay is people and roleplay driven, and the mechanics by nature are a complex behemoth. People are imperfect, and so is our code at times. It's neither medical nor antag's "responsibility" to ensure a smooth problem-free round. It is both of their responsibility however to ensure a roleplay filled round, and that both drive whatever player-engaging roleplay they mean to achieve to totality. You're correct in assuming that having more and more peaceful antags will drop our already slowly declining playerbase.
Antags kill. Antags peaceRP. Security shoots. Miners pop lungs. Engineers Fix Station. Medbay patches People. Wardens man the brig. Psychologists- they talk to people. Keep your head up, while some people will go easy on the medbay, others will not. Maybe try playing sec department if you'd like a change of pace and experience what issues other departments face. I would say medbay is one of the most well-loved and respected departments.