Who is say Danys didn't have a plan?

Yes she wiped out King's Landing - the central throne for the Seven Kingdoms, the sheer symbol of nobility and feudalism (ie slavery) on the continent.
THis is what happens to those who oppose the freedom of all people.

The tree of liberty must be refreshed from time to time with the blood of patriots and tyrants.

Just a thought biggrin

This is not your normal fantasy, after all. Anything is on the table.