... if Mr. Bennet's opinion of Lydia's status in the camp had been fully justified.

We know that Wickham was forced to run because of his "debts of honor", and Col. Forster was already losing respect for him. I think we can reasonably infer that his behavior was becoming public, maybe since some considerable time. What worthwhile woman would have encouraged such a man -- even as smooth a one as Wickham?

We're told by Lizzy that Lydia transferred her affections to whomever gave her any encouragement. It's altogether reasonable to infer that many officers in Meryton turned their backs on her when her (lack of) character became obvious to them. In the camp, there would have been even more such officers. Her six officers at once would have been maybe one or none.

Wickham scorned; Lydia scorned. Wickham without principle; Lydia without sense. Appears to me that Mr. Bennet was truly prophetic.

I'm not a fan of Mr. Bennet, but this makes me wonder if maybe in this, at least, Wickham and Lydia were more at fault than he.

...Nah.