The law is worthless if mages are the ones writing it.
But that is a different argument alltogether. Suffice it to say, it would be ridiculously easy for a mage or an abomination to commit crimes and erase memories to escape punishment. Or simply destroy a small village and then move on. Thedas does not have cellphones, internet, cars, helicopters, etc. The time of response of Templars is simply far too slow to deal with the threat mages pose unless they are down the hall already.
Ultimately, I definitively agree they should not be punished before they commit crimes. But I do not see keeping them in Circle as punishment.
It's prevention, that is all.
I never said the mage had to write the law, only that both sides should agree how much authority each other has and respect those boundaries, no exceptions.
But the law is equally worthless if the mages aren't protected under it or given fair treatment by those who would protect them. Nor is it of any value if it doesn't hold the people charged with enforcing the law to a level of accountability.
No matter who enforces the law, be it over mages or mundanes, I do expect a certain level of responsibility and accountability to those enforcing it, and thus hold them to a higher standard than I would someone else. For example, a merchant in Denerim being charged with corruption and trying to buy off those who are investigating his business practices which may include extortion, bribing officials or such. Said merchant is guilty of corruption, but if a guard captain was found guilty of the same things, I would hold the guard captain more responsible than the merchant because it's the guard's job to prevent such things.
If we're going to have templars enforcing laws on mages, then the templars must be held to a much higher standard, but if the mages are in charge of enforcing laws on their own within their individual circles then the mages in charge ought to be held to a higher standard as well.
I get why you don't think that Circle's are punishing the mages. I happen to think that Circle's can be a really good thing if used properly. The problem with current Cirlces, before Inquisition that is, is how little oversight the overseers (templars) had and how easily mages could be abused by those in power because the current laws did next to nothing to hold the templars to a certain standard and be punished accordingly when they fell short or abused their power. And mages were given so few rights that it would feel more like a punishment to live there than the blessing it could be in having food, shelter and an education.
I mean, if you can get beaten for talking to civilian visitors, then you're not living in a wonderful shelter full of security keeping you safe from the world. If tranquility can be forced upon you for the most minor offenses, like writing love letters and asking a templar to deliver them, then the Circle will most definitely seem a punishment and not a blessing.
Which is why certain boundaries must be set up and respected, with the appropriate level of accountability applied to both sides.