I am so sorry to hear about your friend. This must be very hard for you to deal with.
Have you considered going to the press about this ? I think you are right that many people are failed by the services in place and it needs improving. I think research is growing about better ways to help people and in a few years I firmly believe we will have much better support but the more we can shout about how inadequate things are now the faster this might happen.
Years ago people died from AIDS and now there is so much more help, I do believe mental health provision will improve.
Please trust in how strongly you feel about this because you are right and people deserve better. Could you contact the paper and also write complaints to mind ? This site is not monitored by admins so they won’t know how unhappy you are with it.
Have you spoken to your therapist or anyone else since your friend died ? This is a huge thing to deal with and you deserve some support.
This site is not used much, Samaritans are probably much more responsive than here, have you ever called them?