Some years ago I tracked down the post where this quote of Frank Wilthoit on conservatisme comes from:

"Conservatism consists of exactly one proposition, to wit: There must be in-groups whom the law protects but does not bind, alongside out-groups whom the law binds but does not protect."

It wasn't by Wilthoit the political scientist, who died in 2010, but Wilthoit the composer who wrote it in 2018 as a reply to a Crooked Timber post. In the rest of his reply he gives this solution:

"So this tells us what anti-conservatism must be: the proposition that the law cannot protect anyone unless it binds everyone, and cannot bind anyone unless it protects everyone."

Here's an interview with him and a link to the blog post. His reply is number 26.

https://slate.com/business/2022/06/wilhoits-law-conservatives-frank-wilhoit.html