I dont understand why players behave like this

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This is the game i am talking , the game start with a 5v4, their AD not showing up, and remake vote didn't pop up on them, and their AD backed around 15 min game time when all of their outer/inner tower are down.we could actually win this game much earlier, but our jungle/ad/mid trying to "have fun", they just trying to bully them instead of just end the game. I don't know why players do this , maybe because they are bad and can't win a game so they are enjoy a 5v4 game ? Why league players changed so much. I just feel disappointed.
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