I'm very well aware of there being loads of scammers from the veteran world (evidenced through SSAFA) as well as those who have never served but pose as veterans. What you implied were that those genuine PTSD sufferers should, in your words " Man up" when for some, not all, that is something they find impossible to do and I'm personally aware of some who were present when my son lost his life in Helmand in 2009 who have since committed suicide because they couldn't follow advice like yours. There are many cases of veterans genuinely suffering from PTSD who have similarly committed suicide but I acknowledge that not all do.
As for your personal insult of being a snowflake, it's very far from the truth as anyone who ever knew me would testify. 35+ years (6 as a WO1) of putting up with crap management and sh1te attitudes made me that way, as did the 11 injuries that saw me awarded a 50% War Pension and a further 2 that saw me awarded an AFCS GIP.
Edited in response to a later post by @overopensights
I dont think he was saying that people with PTSD are snowflakes, it seemed that he was implying that people claim to have it when they dont and then use it as an excuse for their own shortcomings.
I, personally, know all too well how real and serious PTSD is but it is not to be used as an excuse to stab people and has in recent years been used as an excuse for all number of things from people claiming to have PTSD because of nasty comments on twitter to falling down the stairs. These are unfairly lumped in with veterans who have it because they witnessed their mates being blown apart and were then forced by circumstance to bottle up, instead of feeling and then releasing the incredible emotional burden that follows in a healthy mind.
Anyway, Genuine PTSD can be treated successfully but it depends on the treatment being sought out. We dont really know the facts of the guy in the OP but it seems as though he did not play the game and use the system. His PTSD may have played a large role in that but the fact is that he claims that he stabbed somebody in the chest because of his PTSD, has not responded to treatment in the UK (he has been in prison where it is available) and is therefore a high risk. Since he is not a british citizen, he is not our risk to bear.