Love and justice are two sides of the same coin. That's a familiar idea to me from Jewish mystical teaching and theology. In the spiritual journey of the Counting of the Omer, the first divine quality we cultivate in ourselves is chesed, abundant lovingkindness -- and it's always followed and matched by gevurah (sometimes called din): boundaries, strength, justice.
It's not only in our mystical tradition, either. In the Torah the call to love our neighbor / our other as ourselves is juxtaposed with "do not bear false witness," "treat workers fairly," and "do not stand idly on the blood of your neighbor" (do not stand by when someone is being harmed, whether with actions or with prejudice or with words.) We practice love through justice.
Love doesn't exist in a vacuum separate from justice. Without justice, "love" is a feel-good veneer hiding a rotten core, what Reb Zalman z"l used to call "whipped cream on garbage."
This isn't just about our individual choices (though those do matter, and should be ethical and just to the best of our abilities). It's also about our systems and structures and communities. If with our silence we normalize unjust behavior, we become complicit in that unjust behavior even if we didn't perpetrate it ourselves. From the macrocosm (e.g. racism, sexism, homophobia, Islamophobia, antisemitism, white nationalism) to the microcosm (e.g. lashon ha-ra, sexual assault, abuse), Judaism calls us to actively pursue justice not only as individuals but in community. We do this not separate from the call to love the other, but precisely as an expression of that call to love.
One might imagine that love is "spiritual" and justice is "political," but Judaism teaches that the spiritual and the political are always necessarily intertwined. Torah and Talmud both interweave "spiritual" teachings with "political" ones. Halakha ("Jewish law," though the word comes from the root meaning "to walk," so I like to translate it as the Jewish "path" or "way of walking") concerns itself deeply both with spiritual / ritual life and with political / community engagement. My religious tradition and spiritual path call me to care for the widow and orphan, to love the stranger, to pursue justice, to give hatespeech no quarter.
Love is a core spiritual value in most religious traditions (including mine). But love isn't enough. In kabbalistic language, chesed (lovingkindness) by itself isn't enough: it needs to be balanced with gevurah (boundaries, ethics, justice), among other things. If we only want to feel love and don't also put our hands to the task of building justice, then we're doing it wrong. If we only want to feel love and aren't willing to do the hard work of seeing toxic systems and structures for what they are, then we're doing it wrong. If we only want to feel love and aren't capable of naming injustice and demanding better, then we're doing it wrong.
Because -- as Cornel West teaches -- love is what justice looks like in public. Torah urges us to love our neighbor, our other, as ourselves. That doesn't mean "love your neighbor the way you yourself want to be loved" -- I mean, in some cases it might, but it can't mean only that. It has to also mean "love your neighbor the way they want to be loved," and "love your neighbor in a way that recognizes their inherent dignity and worth," and that requires demanding for them every human right, every due process, every dignity to which they are entitled. It means not allowing hateful speech of any kind to stand, much less to proliferate.
Love can't be separated from justice. Anything less isn't the love we're called to pursue.
Related: The need for justice to balance love, 2017.