Every time people lament changes to the lore that amount to "not every member of species X is irredeemably evil" and claim the game is removing villains from it, I think how villains of so-caleld evil species fall into two cathegories: a) bland and boring and b)have something else, unrelated to their species going on for them, that makes them interesting.
I feel like the bigger reason to have evil races is to have a more or less ever present challenge and point of conflict. For instance, the underdark is horrible place to be, in large part due to the drow. Their presence and general alignment of evil makes the setting dangerous and interesting. Is this town safe? Have the drow been messing about assassinating local leaders? Should we help this group by liberating them from slavery from the drow?
It's almost like their species is in of itself a character, with this species sized character being evil. Having an entire species be generally evil gives the world more scale than a single evil character would. But yes, an individual villain needs more than just their evil race to be interesting.
But the reason the drow are evil is primarily because of the Spider god Lolth, not because they're Drow. Drow free from Lolth aren't necessarily evil.
Drow freed from Lolth, in isolation of another way being convincingly presented to - likely forced on - them, have had how many thousands of years of abusive culture hammered & manipulated into them. More likely than not they'll still develop an evil culture, though the structure of their society would likely shift due to power gaps. Given how they work either a single powerful demagogue or some sort of council system of the great houses.
Drow even under Lolth aren't necessarily evil but she set them up for biological rewards for evil whenever she can (there's little detail on this but I think that's concept's the source of the terrible "mother's ecstasy at womb murders" thing - good idea, bad example/implementation), on top of enforcing an ongoing culture of brutality and wickedness. Its how most of the evil deities still allow for Free-will to empower their Faith. They combine physiological reward hijacking, adding aspects that encourage easier exclusion from others (isolation is good for limiting options), and rigorous and brutal cultural and societal reinforcement. It doesn't prevent good, but it gives far higher hurdles for an evil race to overcome.