Here are a few choice quotes that I would like to present:-
This one concerns the Amell family
Lord Aristide Amell was one of the most wealthy and influential men in Kirkwall, known for the opulent balls he would host at his mansion. Following the arrest of Lord Viscount Perrin Threnhold by the city's Templar Order, it was universally agreed that Lord Amell would succeed Threnhold as Viscount. Even the Templars agreed that the Amells were worthy successors; however, the family was tainted by a number of scandals in the early Dragon Age and Marlowe Dumar was appointed as Viscount instead.
Revka Amell's firstborn child was found to be a mage and subsequently taken to the Circle, Revka weeping in the streets behind the templars.
This one concerns Perrin Threnhold, the Viscount that rule Kirkwall before Marlowe Dumar
Perrin used the chains extending from "the Twins" at Kirkwall's harbour to block the Waking sea passage and charge large fees from Orlesian ships. Orlais threatened invasion, and the Divine Beatrix III, as a friend to the Orlesian emperor, used the templars to pressure Perrin. In response, in 9:21 Dragon he attempted to expel the templars from Kirkwall. His army stormed the Gallows, and Knight-Commander Guylian was arrested and executed. Templars led by Meredith Stannard retaliated by storming the Viscount's Keep. Perrin was tried and imprisoned by Grand Cleric Elthina and died from poisoning two years later.
So do you expect me to believe that in a city state where Templars have so much power and influence, to the point of being able to drag out the children of one of the top noble families, the Amells for being mages and also having so much say in matters of city governance to the point of being able to lead a successful coup to unseat the previous viscount would just somehow let a Mage Hawke walk around scot-free ?
I can understand Meredith allowing Mage Hawke to walk around scot-free after Hawke had become the Champion of Kirkwall. Before that ? No, that's just absurd. If the Templars can drag Revka's kids around when the Amells were one of the top noble houses of Kirkwall, I think the Templars would have dragged Mage Hawke out of Hawke's Estate to the Gallows. Additionally, I don't think Viscount Marlowe Dumar could intervene or have a say in protecting Mage Hawke because as we can see, there is a historical precedent in Kirkwall whereby the Templar Order and the Grand Cleric, holding more power than the Viscount's office due to the relationship between the Templar Order, the Grand Cleric and the Divine in Orlais.
Add this to the fact you have people like Cullen, Meredith, Alrik, etc, Templars who are at best very strict and at worst anti-mage altogether, makes the notion of Mage Hawke not believable, especially considering the fact that Mage Hawke has to meet Cullen or go to the Gallows or work with other Templars before they become Champion of Kirkwall. No amount of bribery would have stopped Kirkwall's Templars, as we can see with the case of Bethany Hawke if we let her stay in Kirkwall while we went to the Deep Roads Expedition.
"But, but Bioware said there is a quest, a quest that's supposed to show that Mage Hawke is valid, and that they won't be pursued by Templars !"
Bioware says many things but I am relying on in game dialogue as well as Codex entries, not hypothetical scenarios about a possible quest that Bioware might have had or headcannons. Sure, the average everyday mundanes might have problem distinguishing if Hawke is a mage or not but I am sure trained Templars do not face that problem. Most importantly, no matter what you do, no matter what armor you wear, Mage Hawke always carries a staff with them. That's as good as broadcasting that Mage Hawke is a mage to the whole world since in Thedas, only Mages and members of the Dwarven nobility use staves (Dwarves use it for ceremonial purposes).