Why do you think diversity is just as likely to breed discrimination than an homogenous group? People not getting along on a personal level is definitely different than marginalization/discrimination patterns.

If the team is more diverse, someone is more likely to point out when discrimination/prejudice is involved, as there is a higher chance someone will be sensible to the specific type of discrimination involved. Nobody can have a universal perspective on things, and someone from a different background might percieve something you will be unaware of.

Most common marginalization/discrimination patterns can't be addressed by simply saying "there's a discrimination happening here!"

For example, one of the canonical inclusion problems for women is that many people perceive their aggressive behavior more negatively. Hiring more women won't help, because women are equally susceptible to the bias. And calling it out on the spot won't help, because how can you know when other people are improperly forming negative opinions?