1.Omnipotence and holding fate of your defeated opponent 2 different things.
Not if you completely ignore practical limitations.
2.What devs said isn't an opinion pretty much i remember they had post (now i wouldn't be able to find it) explaining why circles aren't slavery and i have arguments as well plain and simple don't qualify as slavery because mages aren't treated as slaves (they don't trade them , they don't froce them to work and they don't force them to doing anything and they have rights) they forced however to abiding law (as everyone).
Slavery without slave trade did (perhaps does) exist, they don't explicitly force them to work (usually) and that's your strongest argument, but it too is not sufficient. They hardly have any rights in practice, their lives are not their own and this basic fact lies is central for the issue of being a slave or a free person.
3.So reason was practical as well because as far i can't find single 1 rule in circles that is created out of spite and have no reason behind it.Also you ignored part that it goes either to relatives or foster family mother can't keep child anyway and as i noted thedas is pretty much medieval like times they don't have organizations that deal with that such things they have only orphanages and it that case child goes to the chantry orphanage what is in fact smiliar and have some practical reasons.
Mother can't keep the baby in prison but she remains its mother and she does to some extent decide its fate. In circle she's denied ANY right to her child with NO input from her. Also, whether the laws are created out of spite or out of fear, they are inhuman and they do reduce mages pretty much to things or animals instead of people.
It is fantasy placed in medieval like times of course there as some differences like magic ,monsters and some differences between our Middle Ages and their but pretty much spirit is done with that.
Thedas is hardly medieval beyond decorations.
4.What matter he found it and could cause destruction and not rly his reason was power hunger and he was self-centred and as i said he could bring and once he did and he would again bring apocalyptic disaster destroying human kind as well other races.And as i said what matter that he could do it and he once did it and tried twice knowing he could blow up world he didn't care.Exalted marches never brought end of the world neither they can so comparing it is ridiculous at worst 1 society (and it is never about killing those peoples as we saw with elves) was at stake never world and in fact wars are almost never about destroying people rather than they are about expansion
You stick to the results (made possible by OUTSIDE power Cory acquired) but what I point out is that everyone going to war, trying attain more power, trying to conquer something, even trying to liberate something - they all have their reasons, motivations and they all consider themselves to be the good guys. And if they do things they consider bad, those are (obviously) acceptable sacrifices.
Also, as I said, all the worst consequences of Cory's schemes were the ones NOT intended by him, it was him failing that awakened the blight, then it was his failing that led to uncontrollable Breach spreading.
You seem to assume I defend Cory as being right, I don't. His example is just to show you how ridiculous is your notion that having great plans supposedly benefiting some society is an excuse for anything. He wanted to re-create Tevinter as the greatest empire, finally with a god that would care for setting world straight (by straight meaning, obviously, "the way Cory wanted it to be"). He just had additional power borrowed from a god to try and use for his goals.
EDIT:
I just realized how heavily we've managed to derail this thread... Seeing as (at least it seems like that to me) we managed to explain both our opinions on most subjects AND it is extremely unlikely that any of us will be convinced to the other's position, I think it would be best to stop this discussion here. I'll read any answer you give, of course (it would be extremely rude not to do so, seeing how long we've debated here) but I'll do my best to stop myself from posting in reply