Laws are mandatory, regardless of whether they're "liberal", "conservative", or none of the above. That's why they're called laws. Laws that could be considered liberal are no more and no less mandatory than conservative ones.
As for a specific example of "liberal" laws from which we benefit are concerned, I cite the FDA. Ever read Upton Sinclair's "The Jungle"? Would you want to eat food that was produced in the conditions depicted in that book? The idea that producers of food should be able to use their own discretion in such matters is naive at best, as you'll presumably agree. (If you disagree, I'd love to hear your rationale for doing so.)
Similarly, labor laws could be considered "liberal". Are you in favor of child labor, people working grueling 16-hour shifts in unsafe and unhygienic conditions, etc? Should industry be able to regulate itself in such cases?