People who go into competitive to throw matches… why?

Matched with two Jeff players in back-to-back competitive matches. One of them ran around in the spawn and refused to play without two tanks. His name was literally No3rdDps.

In the other match, the Jeff player used his ult to team kill and spit the enemy team toward the escort.

Why do people even queue if they’re going to throw? Complete waste of everyone’s time.