starksren:

Cersei/Aerys parallels are easy to make but not very accurate.

The entire reason Cersei was driven to use wildfire on the Sept was to destroy the Faith who were attempting a coup on the Crown. They shamed her publicly for a minor crime, took her son as their figurehead who then outlawed trial-by-combat, (effectively killing or exiling his own mother). 

You also might claim that a lot of people in the Sept were innocent, but in her view every Lord and Lady who entered that Sept was legitimising the High Sparrow’s power. The Sept of Baelor stood as grand physical embodiment of his seat of power. The Faith had to be destroyed or they would have taken over the kingdoms.

Aerys, on the other hand, burned people alive for the hell of it because he saw imaginary enemies surrounding him. He burned people on a whim for his own delusions. Cersei isn’t mad or insane, she’s cold and ruthless when it comes to dealing with true enemies. Cersei learned this from her father. Twyin, who committed genocide against House Reyne, remember.

So while it’s easy to make comparison because they are both monarchs who used wildfire, it’s not exactly the same.