Toi and Cherrybim — RSRH says (I’m paraphrasing) that Eisav went wrong because his parents provided an education tailored to Yaakov’s middot but left no room for someone with Eisav’s middot to serve Hashem. RSRH believed that hinukh must be intensively individualized and that no mida is off-limits in serving Hashem if it’s educated correctly.
You can imagine how this was greeted in certain circles.
Fire away.