Game of Thrones, Season 7

[Tyrion and Varys talk over the battle's aftermath at Dragonstone]

Tyrion Lannister:
All rulers demand people bend the knee; it's why they're rulers. She gave Tarly a choice. A man who had taken up arms against her. What else could she do?

Varys:
Not burn him alive alongside his son?

Tyrion Lannister:
I am her Hand, not her head. I can't make her decisions for her.

Varys:
That's what I used to tell myself about her father. I found the traitors, but I wasn't the one burning them alive. I was only a purveyor of information. It's what I told myself when I watched them beg for mercy. "I'm not the one doing it". And the pitch of their screams rose higher..."I'm not the one doing it". When their hair caught fire and the smell of their burning flesh filled the throne room, "I'm not the one doing it".

Tyrion Lannister:
Daenerys is not her father.

Varys:
And she never will be...with the right counsel. You need to find a way to make her listen.