Identity politics, a writer friend reminds me, is where liberalism goes to die.

The oceans are boiling, freelance journalists’ heads are getting lopped off, and there’s not the slightest sign of resistance to income inequality so out of control it would worry Cornelius Vanderbilt. Yet the Internet’s politically-correct “social justice warriors” are dedicating their formidable energies into attacking pissant trivialities.

Anyone who doubts that online slacktivists have their heads so far up their collective asses that they can’t see daylight need only read up on the controversy over Undercover Colors, which is a nail polish that allows women (or men, but they’re not the target audience) to discreetly discover whether their drink has been spiked by one of several common “date rape” drugs.

(My advice to women: if you’re at a party or with a guy so sketchy that you think you may have been slipped a mickey, don’t bother with the fancy polish. Just scoot. You don’t want to be there anyway.)

Better safe than sorry, right?

Wrong.

“Anything that puts the onus on women to ‘discreetly’ keep from being raped misses the point,” writes Jessica Valenti, a once-influential feminist blogger whose hammer-to-the-skull-obvious post-motherhood columns for The Guardian add to the case for automatically censoring any piece of writing by a parent about their children. “We should be trying to stop rape, not just individually avoid it.”

Um, what?

Valenti is serious about this: “So long as it isn’t me isn’t an effective strategy to end rape. ‘Undercover Colors’ polish and products like it only offer the veneer of equality and safety. And that’s simply not good enough.”

Which is true. And stupid.

Like: wearing shoes isn’t an effective strategy to stop assholes from breaking glass bottles on streets. Since assholes do leave shards of glass all over the place, however, walking barefoot isn’t smart.

Installing a car alarm or using an anti-theft device like The Club is an example of “individual avoidance.” One wishes that it were possible to leave one’s automobile unattended free of fear that someone might steal it. But reality dictates that, if you park in a high-crime neighborhood, you take measures to deter thieves. True, it’s a “so long as it isn’t me” strategy. But what else can you do? We’re not likely to see an effective strategy to eliminate car theft any sooner than “an effective strategy to end rape,” a crime endemic in every culture throughout history.

How removed from the real world are writers like Tara Culp-Resser of Think Progress, who also criticized the entrepreneurs who invented the anti-date-rape polish? “It would likely be more effective to focus on larger efforts to tackle the cultural assumptions at the root of the campus sexual assault crisis,” she wrote. “Like the idea that it’s okay to take advantage of people when they’re drunk.”

To my horror, I have known men who bragged about having raped inebriated women. (Since their accounts were devoid of details, it would have been pointless to report them to the police.) They didn’t violate women because of “cultural assumptions.” They did it for the same reason that CEO pigs issue themselves huge raises the same day they fire thousands of employees: because they can.

This reminds me of the complaint against liberals who claim to support public education, yet send their kids to private school. If your local public schools are decrepit or dangerous, it’s unconscionable to subject your children to them if you can afford not to. Obviously, we should fight to ban private schools, and for that matter the capitalist system that separates American kids into pre-poor and pre-rich educational systems — but until the revolution is achieved, it’s every man and woman for himself and herself.

Feminist propaganda can’t stop rape. No marches, no poster campaign, no hashtag bullshit. Men will stop raping women when they no longer can.

Neither I, nor the social justice types, know how to achieve that better society. Until someone comes up with that Big Idea, anything women can do to protect themselves — self-defense classes, carrying pepper spray, even a nail polish — is just common sense.

(Ted Rall, syndicated writer and cartoonist, is the author of “After We Kill You, We Will Welcome You Back As Honored Guests: Unembedded in Afghanistan,” out this week. Subscribe to Ted Rall at Beacon.)

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