Reasonable, as used in the law in many if not most situations, has become a contronym. Reasonableness should be rigorous: it's in the term itself (capability of being reasoned / derived through reasoning). The intent behind the term is to use logic to ascertain / derive / apply the (sometimes tacit) social rule; but many judges turn that into "I'm reasonable (i.e., I'm not unreasonable, meaning clearly wrong much of the time), and this is my decision (whether or not I explain my supposed reasons to expose them to analysis and criticism), so therefore my decisions (and the things at issue) are reasonable; or, in my view, the thing at issue was not reasonable." Of course, such reasoning is itself illogical and, in my view, therefore unreasonable.