[jqpabc123]

The claim that major elements of the social contract can be derived through logic and reason is controversial.

The "logic and reason" here has to do with the fact that the social contract is sufficiently real and functional enough to transcend mere "belief" in most people's lives.

[snikeris]

In other words, the belief is pragmatic.

[jqpabc123]

As pragmatic as your "belief" that you own the computing device used to make your post.