Putin, thankfully, doesn’t seem to enjoy killing for its own sake.
Neither did Hitler. He always had extrinsic goals to be achieved by killing. Often those were quite admirable goals if you accepted extreme partisanship for the German people at the expense of everyone else. (Not always; he suppressed domestic opposition ruthlessly, but it was nothing in comparison to his treatment of non-Germans and no different from most other states at the time.)
Neither did Hitler. He always had extrinsic goals to be achieved by killing. Often those were quite admirable goals if you accepted extreme partisanship for the German people at the expense of everyone else. (Not always; he suppressed domestic opposition ruthlessly, but it was nothing in comparison to his treatment of non-Germans and no different from most other states at the time.)