Curate, connect, and discover
With this being a very heated debate on who's right or wrong. I just wanted to throw in my two cents.
Aemond probably didn't mean to kill Lucerys, however I do believe that in order to claim/bond with a dragon there needs to be an emotional connection. Vhagar is feeling the bond with Aemond and his hatred towards his nephew. She acted on it.
Either that, or Vhagar is just reliving her glory days in Dorne.
That's all, thankyou for reading my Ted talk.