I mean, it can be looked at that way, but since it is a dream the people weren't real anyway - it isn't murder in that case. It'd be like saying we're all monsters because we wake up from our dreams, and doing so destroys dream realities. We aren't meant to sleep and dream forever, though.I mean, the game says it's the Wind Fish's dream. The Wind Fish itself seems to warp reality around it. The fanfiction writer in me would suggest that it effectively created a pocket dimension around itself. Unfortunately, the implication then becomes that waking up the Wind Fish effectively murdered everyone on Koholint Island.