He was assessed twice by medical professionals and deemed fit to be charged, to be fair.

I think I’ve figured out the problem. When I say “prosecution is justified in the case where a suicide attempt broke laws that are designed to protect the safety of others”, I don’t mean the guy needs to be sent to jail. I mean that the mental health charity’s position that he should be treated with compassion in a general sense does not mean that the legal system just says “we don’t get involved if it was a suicide attempt”. The system can’t make huge subjective calls like that or it all breaks down, it’s regretfully necessary to prosecute in these circumstances.