I’m convinced that this conversation made jon Kill dany, not with tyrion (it opened his eyes, but aryas was the one that made him do it)...

Tyrion gave Jon a reason. Arya gave him a deadline. “I know a killer when I see one” wasn’t analysis. It was a warning that she’d do it if he didn’t.

This is absolutely it You couldn’t have said it any better e

Jon was always gonna stop Dany. He just needed to hear what she had to say first. If you remember he is pleading with her to help people make sense out of what she just did. Jon didn’t want to end her but he realized while Dany was speaking that she was going to keep on killing.

Yah that’s true

I don't think so in my opinion I think Jon have it in mind already but he needs more validation to be able to carry out the mission of killing dany

Jon loved her I doubt

Tyrion made it a speech. Arya looked him dead in the face and said she already recognized the type. That’s what actually moved him.

"I know a killer when I see one" thanks Arya , when I saw you Dany burn the city I didn't think that , only thanks to you saying that line I finally know now

That was all the confirmation he needed

Yeah Jon who saw it with his own eyes needed that confirmation

Tyrion explained why Dany was dangerous. Arya made it feel real.When she said she knows a killer when she sees one, it wasn’t just talk. It sounded like she was already ready to act if Jon didn’t.

I can see that. Arya’s warning made Jon realize just how dangerous Dany had become.

Tyrion gave him the argument. Arya gave him the look that said the Starks were done waiting.

Tyrion gave Jon the information, but Arya’s warning made the danger feel personal and immediate. Tyrion opened his eyes to what Dany had become; Arya made him realize what could happen to everyone Jon loved if he did nothing. In the end, Jon made the choice himself, but Arya’s warning may have been the final push that made him act.

It’s not the conversation, He knew she had changed and needed to be stopped

Jon didn't kill her because Arya told him this. He killed her because he saw her burning King's Landing and listened to her explain why she did that. Arya just warned him.

You’re right on this take

It sounded like she was already ready to act if Jon didn’t.💥

One way or the other every mad ruler is always taken down 👀

Tyrion gave the reason. Arya gave the push. That line did it.