I agree, and recognize it can be abused (in either direction)- but just last week you have a guy , on video clear as day, walks into a bar and starts shooting at his ex-gf (before being jumped by other guys) - I have no problem taking away his guns while he is awaiting trial.
There has to be some common sense.
Common sense and history reveals that governments abuse its citizens.
Hence the US took the extraordinary step of forming a government that is not to deprive rights without due process.
An accusation is not due process.
It only looks like a lack of common sense now because we have the government generally following due process, which leaves the actual criminals having a temporary advantage to perform their own abuse.
But laws like those presented in the article will soon turn that table and you will see guns seized for trivial reasons at which point the wisdom of the due process rule will be painfully apparent.
And by then it will be too late and only rectifiable with revolution like had to do before in the face of government tyranny.
As for medical...chronic,long term schizophrenia can warrant a permanent ban,Parkinson's Disease can warrant either a temporary or permanent ban.
Hold him without bail, if he's that dangerous.