In object relations, the opposite of splitting is the ability to see both good and bad in a person.
However many intelligent individuals mistake relational capacity for cognitive capacity. And they think if they can shove their nuance everywhere politics goes, that means their hearts are still intact. Same for people who try to prove that they have enormous empathy by having politics that includes everyone and everywhere.
Even now, if they learn the theories, which, many of them do, and know they should point out some flaws in people they are supposed to love to prove they are not splitting, it's still a performance.
Does it matter if it's just a performance? Maybe they can make it if they fake it enough?
Relational capacity is a lot like defense, it's something you do regularly as a habit. That's why it takes years for certain groups of people with professionals to learn not to split. And I'm talking about like 10 or 15, not 2 years. Even then, it's not guaranteed that they could ever succeed.