Why are derivatives controversial?

Why are derivatives often seen as controversial in the world of finance? Could it be due to their complex nature, making them difficult for the average investor to understand? Or is it because they allow for speculation and potential risk taking, which can lead to significant losses? Additionally, do derivatives contribute to market volatility, making it harder for investors to predict future trends? It's worth delving deeper into these questions to gain a more comprehensive understanding of the controversy surrounding derivatives.