Watching the 2018 Winter Olympics games I've noticed a few times that the team with the hammer doesn't go for an easy shot on their last stone. Instead of just putting the stone on or near the button when the circle is quiet empty, they hit the other teams stone and clear up all the stones.
What's the reason behind this? Are there rules regarding when a team can put a stone on the button? Or will this move give the team an advantage moving forward in the game?