Is it the king and queens fault that the Europeans went to war with the natives?

Answer 1

What exactly are you talking about? European monarchs were quite different from each other, who are you referring to? And what natives? Europeans went on a colonizing spree across the world between the 15th and 19th centuries, where they came into contact with "natives" from every conceivable part of the world.

If you're referring to Spanish, Portuguese, British, French and Dutch colonization of the Americas, the monarchs were partly responsible. As the heads of the kingdoms, vested with virtually all authority and power, it was them who made the decisions to commence with American colonization. At the same time, there were tons of other actors, from explorers to merchants to missionaries who all had a stake and an interest in colonization.

The Spanish Crown made the decision to continue to send conquistadors to the Americas, but it wasn't a decision made in a vaccum. It was a combination of personal and political desires that led to colonization.