I have no problem with 1 & 2 and agree that 4 should not even be on the radar.
Regarding 5 it really seems to be an extension of 4. I support the second amendment and would never want to see gun ownership entirely forbidden but, by the same token, I don't see our guns protecting us from the current erosion of our civil liberties, which I don't think you would argue is not happening.
3 is an interesting scenario and likely the one I can get most behind but my next question is what type of guns do you need to feel safe in this situation? Let's face it, the government is never going to take away all of our guns but do you truly believe that you would need a fully automatic rifle or even a semi-automatic AR-15 with two high capacity banana clips (or something along those lines) to make you safe in the civil unrest scenario? Wouldn't your hunting rifle(s), shotgun(s) and handgun(s) make you feel secure enough that any predators would move on to easier targets?
Also I wish you would post links or mention sources of any studies you wish to put forward. I am not disagreeing with the data, it certainly passes the smell test, but it helps put things in context.
A so-called "Assault Rifle" is an extension of 1. It's a fun sporting rifle to shoot and hunt with. It features a slower moving, smaller bullet that does LESS damage than most commonly accepted hunting rounds. The fact that idiots who know nothing about firearms are attacking it is reason enough for folks to bristle up and defend it.
You can argue against capacity of magazines all you want but it's a fools errand that I'm not getting into. Want to outlaw 100round barrels? Sure. Go for it. Want to outlaw standard 30 round magazines, You're a ####### and good luck. That's the last I'll address on that matter. Erosion of liberties is indeed occuring and giving up our right to bear arms would be another. I'm not sure why it needs to be related to any other loss of liberties when it qualifies as such on it's own. My Shotgun and handgun are excellent for close quarters combat. Me, I'd rather that IF in the UNLIKELY scenario #3 comes to pass, I have something with a bit more range so I can keep harm outside the reach of my family. For that purpose I have selected my AR-15... PRIMARILY for enjoyable target/sport shooting... but alternately as a long range form of self defense in the unlikely event need arises. My AR will NOT be my first firearm I reach for when my home is broken into (That would be a shotgun for a combination of it's close range effectiveness while limiting collateral damage outside by home by stray rounds. I am a little perturbed by the fact that you simply brush aside 1 & 2 which are my primary reasons for wanting to own a firearm... those are plenty of reason for me and, frankly, that's all that matters.
I don't like the label "assault rifle" because it's too much of a (forgive the language) moving target. But the most popular semi-automatic rifle, by a wide margin, is the AR-15 which can be modified to fully automatic with little experience or effort. It is a highly dangerous weapon with all the mods that can be done to it, and the argument that it is more fun to shoot does not seem very strong as a position to defend the right to own one. Not being able to have an AR-15, or the like, does not inhibit your ability to hunt in any way, I am sorry if it infringes on your fun.
And regardless of whether or not you want to discuss it, magazine size seems to be very relevant. There is a clear example in the Clackmas mall shooting where the break in fire allowed a citizen with a conceal/carry to draw his weapon and target the shooter. Whatever leads to breaks in fire, like having to reload more frequently, would absolutely lead to more opportunities for lives being saved. That is pretty difficult to argue against.
As far as longer range to defend yourself in a case of civil unrest, exactly how long range do you need? And why won't your standard hunting rifle do in that situation? You expecting to be in a situation where the government response is so very slow that you will have to fend off massive hordes or people with malicious intent? Seems to me that barring a complete and total breakdown of the government to a dystopian post-apocalyptic state that is an unrealistic scenario.
If you think it is a realistic scenario perhaps you should audition for Doomsday Hoarders.