This backstory for Dolohov makes sense to me. - What a lovely compliment! It has always seemed to me that there would have been very little incentive for anyone in that world, other than the pure-blood elite, to have joined up with Voldemort. After all, what could he have offered to them? The idea of someone accepting you and empowering you, especially if you are someone who has had the brand of "outsider" applied to you in such an insular world, seems powerful, indeed.
Thank you for taking the time to read and leave such a thoughtful comment!