I echo this view, but with several caveats. It's important to understand that Big Law firms see students who care about "social justice" as a flight risk, as someone who'll take their gross junior salaries after a few years and leave the firm for government position or social justice practice. In these cases, the higher your grades (think A average or better), the more of a flight risk you are. Assessing whether someone is a flight risk is dependent on several variables (grades being one of them, since students with strong grades can lateral more easily than those who don't). It may be possible to care deeply about social justice issues but pose no flight risk to Big Law firms, in which I don't think they'll care much about your extracurricular hobbies.
In my experience, and from anecdotal evidence, I believe "smaller" employers/firms value clinical experience with students more than their experience with a law journal or research assistance work with a prof because they don't really have the resources to train students for what law is really about (outside of academic legal thought). Larger employers see experience with a law journal or RA work with a prof as a sign of intelligence and value that over experience they can more easily and readily train in their students. My advice to you to focus more on relevant clinical experience is tailored to your situation (you've now struck out of the formal articling recruit and only have any chance with a "smaller" firm).