It is probably because the proof is either relativizing, natural or algebrizing. It has been proven that those types of proofs are not going to work. The people

It is probably because the proof is either relativizing, natural or algebrizing. It has been proven that those types of proofs are not going to work. The people who submit these kind of proofs often do not understand that they are never going to work. Why would you, as a serious mathematician that understands this to spend your energy to refute some proof for which you know that it already has been refuted. It is the same why designs of peperpetium mobilium devices are not being refuted.