I'm not sure what you're getting at on this one. This individual faces potential incarceration. He is on bail and would be denied access to dangerous things... in theory. Of course he manufactured explosives, so it's not like he has to pass a background check to come into possession of them again.
"and we'd all be able to be afforded greater freedom if we did a better job in managing those particular people's access to lethal things."
Do you have some examples of additional freedoms we're missing currently?
"Of course, the NRA has historically been the biggest lobbyist blocker to anything of that nature, given their paranoia that any legal government consequences will spiral into a panopticon."
I'm not exactly sure what you're referring to that they oppose. But the legal term for a slippery slope is the Overton Window. Speaking of gun regulations generally, it's not hard to understand why a pro-gun group would be against the types of additional regulations that are already present in other states that arguable do not improve safety or could even reduce it in legitimate use circumstances (eg hollowpoint bans, etc).