These days, he isn’t an attempted murderer. Every single Aveirah in the world can be pinned on some sort of medical problem – for example a theif suffers from “kleptomania”… i don’t need to go into details. I’m sure within the next few years they will come up with an excuse why it is okay to murder.
And to answer your question, Wolf – No, it is not to have an attempted murderer in a shul – he should be put in a cheirem, to say the least – if possible locked up in a prison or hospital somewhere. Or go to therapy (there is therapy available for every type of aveira as well)