Why did the dragon burn the chair?

Why did the dragon burn the chair? Now, there are two theories here: One is that Drogon, a smart dragon, recognized what the Iron Throne symbolized and burned it, rebuking the desire for power that ultimately killed his mother. The other is that Drogon mistakenly thought that the pointy sword chair stabbed and killed Daenerys.

Now, there are two theories here: One is that Drogon, a smart dragon, recognized what the Iron Throne symbolized and burned it, rebuking the desire for power that ultimately killed his mother. The other is that Drogon mistakenly thought that the pointy sword chair stabbed and killed Daenerys.