Those who perpetrated the Yom Kippur TA shuls pogroms and their supporters also became holy? Where is Moshiach??
There's a spectrum from Erev Rav to Tzadik Gomur, although in a moment of true teshuva, everything is possible, as the Rambam says. I hope you don't make a bracha levatala when you say Slach Lanu three times a day (as the Tanya points out).