My understanding was that this guy had not published a manifesto declaring his intent to kill people. He had "drafts" of some nonsense on his computer. The Parkland guy had been in trouble repeatedly and was clearly a time bomb. Same with the Orlando nightclub shooter, who was under FBI watch, but probably was given more latitude because he was muslim and his father was some sort of informant.
I am not defending this Coastie, maybe he was dangerous, certainly he was disturbed. I am just pointing out how easy it is to go down the slippery slope where having a few firearms and visiting some sketchy websites is justification for law enforcement to kick your door down. Any idea that we can trust them or their judgment or integrity should have gone down the drain with the revelations about FBI misconduct relating to the Trump campaign.
We hear a lot from the left about "this is not the kind of country we are." My position is we are a country where you can have as many legal guns as you want and visit whatever websites you choose and it is not the business of the government or anyone else.
There is certainly a slippery slope. But balance must be maintained if we are to apply standards equally and keep people safe. As a member of the armed forces, this man had no privacy and there was something that tipped of an investigation that led to a determination of him being a thread. I, for one, am glad they got to him before anything happened.
Now, this is all based on the information available. If it comes out later that this isn't how it went down, and his rights were violated or that he was not guilty of what they claim, then that is a different story.