Not a very representative example. Excpet for the first guy all of them are just the Yes-man in the beginning of act free, who basically just repeat everything you said in the fight between Meredith and Orsino, because you are the Champion. If you side with Orsino they talk about how Meredith is out of line and about not all mages being bad.
That being said your point that most people in Thedas are against mages is actually true. I'm just urging you to research actaul valid proof of it next time.
Also the point stands that many parents wouldn't hand over their children to be killed. Isolde, the Hawkes, Fenriels mother, Ser Thrask and Meredith parents, Comtesse DeLancet all tried to hide their children from the templars. And they just wanted to spare them the circle. The number might significally rise if you outright kill the mage children. You apparently underestimate the love many parents feel for the children they raise.
And that are just those that actually live under Chantry rule. The Dalish would most likely never hand their mage children over to get them killed and neither would Tevinter. The latter would just laugh at you and trhrow fireballs in your face. Hell not even the qunari would agree to your ridicioulous plan for that matter.
Isolde and Tharsk were idiots new anti-mage policy will severely punish such peoples like isolde not mention that previous system was focused on watching mages not hunting them so most templars was watching mages now every anti-mage will hunt on mage so it will make easier to find one.Also detection of mage and telling anti-mages about it will be rewarded so it will also feed on greed another human flaw.
And as i said it won't because as i pointed above i will increase hate and fear of mages , as well fear of punishment and encourage population to selling mage for reward well if person is poor they need money desperately if person have a lot money they want more. 
And as i said i want create new anti-magical order anti-mages who will be trained from child will be teached to be ruthless and kill mages without remorse so we don't have peoples like thrask...
Well if thats your strategy you won't be making it very far. If you severly punish nobles like Isolde (no matter how stupid she was) you'll make yourself very few friends among their common noble peers. If you pull of things like that too often You'll find yourself with a dagger in your back soon enough. And don't give me any nonsense about how you'd be badass enough to kill everyone who tries. Everyone has to sleep sometimes.