I don't think ponyboy is defending June at all.
It's kind of like when an employee leaves your company. Sure, it could be the best for the company. And sometimes you are happy they left because they were disruptive at the end. But the best companies try to look internally and see if there is something that pushed him out and caused him to be come disruptive, so that it won't ever happen again.
At some point you hired that employee because you really liked them. And then something changed along the way. Just look around and make sure it was really the employee who acted different than you expected and that it wasn't the company who had a negative impact on the person.
And, no that is not a defense of June in any way. At all. Just saying take a look in the mirror and make sure nothing is wrong for the next guy.