The line of discussion was about solving the problems of the mages and specifically whether this was necessary for them. I was responding specifically to the idea that these restrictions are in the interests of the mages. They are not. Most of the justifications you provide are either arguments that mundanes would benefit from locking mages up, or arguments where mundanes benefit and mages are harmed, but there is an overall benefit (according to Templar/Circle supporters), or finally arguments that both groups are dangerous to each other, but mages should be locked up to prevent the rise of mages winning such a disagreement ('mage elite' as you phrase it), though I personally don't see why that's worse than a 'non-mage elite'.
If most of the justifications provided for the system benefit the mundanes more than the mages, it's probably because the system was brought about by mundanes, for mundanes, after a long and traumatic period of mage empowerment. Societal segregation between mages and mundanes, by the absence of mages, would naturally benefit mundanes more in the hypermajority of the population. Just as societal integration and freedom would benefit mages more, if their natural abilities are allowed to give them competitive advantages in the population.
The difference between a mage elite and the non-mage elite is the difference in potential abuses and ability to remove abusers. Non-mages require institutions, organizations, and a whole lot of numbers to make comparable abuses to a small empowered mage minority.
The larger point is that those comments were specifically on the point that the real problem mages face is being locked up, not the fact that mundanes hate them (except insofar as the latter leads to attempts to lock them up). Also, as we are discovering locking powerful people up because they 'may' do something, annoys them and leads directly to 'multiple real security threats to life and liberty' for all involved as well, when they decide they don't like being locked up and will kill you if you attempt it.
The comments were addressing your skipping over of the reasons mages are segregated in the first place, similar how you skipped over many other motivations for the Circle to attack a small spectrum that, in and of itself, is not the justification for the Circle. The Circles weren't invented in a vacuum, but as a consequence of very real social pressures and pre-existing attitudes towards mages that, to some degree, still continue. The mages engaging in violent rebellion doesn't resolve the forces that saw the mages suppressed in the first place.
Your argument never really addressed that point, and instead made a selectively narrow attack on something else.
As for whether the costs of occassional mage uprising outweighs the costs of allowing integration? That's an argument, and a viewpoint, that the non-mages (who are the wider society) to decide if it's worth it or not. The Circles have functioned without a major revolt far, far longer than any real world western liberal demoracy has existed, let alone gone without a major internal conflict.
Going off of history, most nations have progressed despite the occasional or even regular uprising and incident. The costs of putting down an uprising can often be considered 'worth it' compared to the costs of allowing the uprising to succeed or empowering/appeasing the aggrieved.
Also, the question isn't whether people should venture into dangerous areas, the question is whether they should be allowed to do so if they accept the risk, especially if they are the innocent party. Especially when the authorities are making no attempts to stop the aggressors or do anything about their aggression.
This works both ways, and hinders the mages more than the mundanes.
Because of the risk of abominations, all areas around a mage can be considered a danger area. We're not talking about even basic and deliberate magical abuses and accountability here, but just the risk factor that someone, for any reason, will get desperate or stupid or ambitious and let a demon in on purpose or accident. No deliberate intent or moral failing is needed for an abomination.
If there is an allowance to enter a dangerous area of your own volition, should there not also be a right to not allow a dangerous area to be forced upon you? A right for mages to travel freely is a right to place innocent parties into a danger area.