> rabbi kook would see what his movement led to, the lack of tznius,
Do we know that? what would have happened without him? Maybe, same people would end up in kibutzim and there would still be a commi-socialist state in Israel. Same, as people complain about some Chabad baalei teshuva behaving inappropriately. Maybe their alternative was to be in drug rehabs or gender studies before they bumped into a shaliach on campus. (hope, I am equal opportunity offender here).
If you blame R Kook for admiring Jews playing soccer on shabbos, what did he do while he lived in more observant places in Europe: did he encourage observant Jews to play soccer even on chol? If not, maybe you should not complain.