[dragonwriter]

> In particular, classical liberalism depends on rational actors

It does not; classical liberalism is an ideology that depends on a particular structure of moral precepts of rights, independently of how people might make use of them.

The utilitarian, rather than deontological, argument for laissez-faire capitalism depends on the rational (in a very particular technical sense) actors, but this is (while people who identify as “classical liberals” overlap considerably with rhetorical, at least, advocates of laissez-faire capitalism) not the same thing.