Explain why bottom trawling is still being practiced when it is generally acknowledged as destructive and unsustainable?

Bottom trawling is a practice of catching fishes using a net starting from the sea floor which will be dragged by a boat to catch the fish that is in the area. The result would be overfishing. L ittle fishes can get caught because of this practice.

I think F ishermen try to do this because they earn more using this method, even if they understood the circumstance of practicing it.