Why are some memaids scared of humans and evil?

Some mermaids may be scared of humans due to historical tales and myths that depict humans as destructive or harmful to their underwater world. Additionally, the fear of the unknown can make them wary of human intentions, especially considering the environmental impact humans have on oceans. The portrayal of evil in folklore often associates humans with greed and violence, reinforcing mermaids' apprehension. Ultimately, these fears are rooted in a deep-seated instinct for self-preservation and protection of their habitat.