In the case of Venturini, perhaps you loved her as a volleyball player but we don’t really know these players as people. Maybe you don’t agree but I think it’s possible to still admire and respect her as an athlete but also criticise and condemn her personal actions.
I actually think it is possible. I still admire her career as a volleyball player. I wouldn't be able to take it away from myself, cause that's part of my history as a volleyball fan too. I just cannot bring myself to root to them.
In a way, I think it's easier to deal with this if it's a player who already finished their career. I think it'd be a lot harder if it was someone still playing. That's why I can appreciate the game (for instance, yesterday Brazil vs France was a hell of a match) but I can't root. I was going through some social nework posts, and I saw people ecstactic over our win and all I could think to myself was: really? Those guys? Ok.