Breaking minhag yerushalayim, even if a rov somehow thinks it’s ok to go up, would be unconscionable if not for the blindness that zionism causes. The number of jews it puts in danger should also be sufficient reason to forbid it, but zionism is an egel hazahav which does not allow these rabbis to see what’s clearly in front of them.
Comparing that to minagim based on rishonim (like eating indoors on shemini atzeres, it’s tosfos) or gedolei yeshivos (like rav yisroel saying to make kiddush before tekios) is mind boggling.
Putting jews in danger puts one outside the category of oseh al daas beis din patur, even if we were to say that the rabbis being followed are legitimate baalei horaah.
Interesting that this same supposed baal horaah was moser klal yisroel beyad akum to advance what he thought was the saving og lives that were at risk from bris milah. Tell me how a supporter of tendler justifies endangering jewish life to walk up on har habayis, which is no chiyuv, but not for bris milah, which is a mitzvah?