I can only recall one accident during all those years involving a PPL student and that was a ground loop in a Luscombe by a PPL student doing solo circuits.
I've seen a Luscombe that hasn't been ground looped (note singular tense). I've also seen a lot of damaged Luscombe wings hanging on hangar walls ready to be repaired some day. They made them with detachable tip spars knowing what could, and in fact did, happen.
I think people land poorly because they don't perceive there is a penalty for doing so. With a tail wheel aircraft like the Luscombe the primary student (that was me) becomes aware that every landing must be the best his primary skills allow, or he may very likely end up with a wing on the wall. Fear is a great motivator. Whether you think that is beneficial to training depends on your view of fear as a learning tool. Much like discipline in schools actually.