The Death of a King in Blackwater Bay

I can definitely see all kinds of reasons and explanations in every direction but it just does seem a little unusual to me that pretty much everyone died in this stone castle where there couldn't have been that much wildfire compared to other moments. It just made me wonder if that might have been more of a tragedy if someone borrowed the doors yeah no it's absolutely possible i don't thinksomeone borrowed the doors but I'm specifically talking about Summer hall which is the Targaryen like palace like summer. There may have been some sort of sabotage at this event  that would have been a pretty known event like the king and all the king's guard all these people there to celebrate the birth of the baby