Why did Britain want to punish Germany?

Clemenceau wanted Germany treated harshly so they were unable to invade again, they had already invaded twice in his life time (Franco Prussian war and ww1). he also wanted them punished harshly because it was what the people of France wanted and if he wanted to stay in office he would have to punish them harshly. Germany also caused a great deal of damage to Frances infrastructure, human life and economy.