Sometimes when people post lone comic panels for humorous purposes, the humor comes from the loss of context from the original story.
And sometimes, knowing about the story (in this case, from the Samson story of Fantastic Comics #7) doesn't help one whit.
Yes, you read that right. This random bad guy, name of Sanglor (no, I don't know) destroys his island. His own island.
Apparently just to be a jerk.
Here's a tip, guy: Most people sell their old homes.