Libertarians often create 2-dimensional (flat) caricatures of society, then get lost in their own logic (they fall in love with their own ideas). These caricatures so removed from actual experience that they discredit the idea of liberty. Hybridizing rationality with the rich meaning that Peterson is re-introducing to western thought makes for a stronger footing - one that works in practice (it can be lived) and in theory (it makes sense).
For more reading, check out our 3 part blog series on the same topic:
Part 1 - That which you value most
Part 2 - A bargain with the future
Part 3 - God's blessing