that's what i'm trying to communicate. Yes, doing what she did to Vary's is fine. What she did to Randyll and Dickon Tarly is fine. Those are people who betrayed her or defied her. The people of King's Landing did neither of those things. They were not loyal to Cersei, they're just people who "pray for rain, health, and a summer that never ends. They don't care what games the high lords play."
You can't justify their mass murder. You only turn everyone against you doing that shit. Unless she plans on sleeping with Drogon next to her, she's just asked to be killed in her sleep. Or poisioned. (Though it does seem that there are way more Unsullied and Dothraki than we were lead to believe. Actually in the trailer for the final episode, it looks like she's got as many Unsullied as ever)

This is why Jamie killed her father (granted he didn't have a dragon). You just can't do shit like that. You've crossed the line of fear at that point.