At least now we're arguing over the right thing: the need to hike housing supply.

Whenever I write about complex public-policy problems, I hear from readers who ask something like this: "OK, wise guy, if you're so smart then tell me how we fix the problem."

Unfortunately, there aren't many vexing issues that can be resolved in an 850-word column or a 50-word email rebuttal. Most of California's myriad "crises" have been years in the making, and they will take years of unraveling—provided they are fixable at all.

The best example is the state's housing mess, which recently has sparked angry debates in the Capitol as home prices soar, homeownership rates plummet and homeless encampments become ubiquitous.  You know the problem has gotten severe when lawmakers have moved beyond the usual superficialities and false solutions designed mainly to give politicians cover.

As journalist H.L. Mencken wrote, "There is always a well-known solution to every human problem—neat, plausible, and wrong." In California, that simple, well-known and wrong solution is to provide more subsidies and programs. There will never be enough taxpayer money to subsidize an apartment for every Californian who needs one.

At least now we're arguing over the right thing: the need to hike housing supply. The crisis is caused by years of local and state regulations that make it tough to build new developments. In 2015, the Legislative Analyst's Office reported that California is falling 100,000 units short each year to house its population. A new study from UCLA finds that zoning restrictions make it infeasible to meet the housing goals set by Gov. Gavin Newsom. Something has to change.

The change agent is Sen. Scott Wiener, D-San Francisco, and his laudable Senate Bill 50. Last year, a similar measure—to require localities to approve high-density apartment buildings and condos around transit lines, provided certain conditions are met—died a quick death. This year, the bill passed out of committee, but has an uncertain future. Suburbanites, even in elite suburbs of Los Angeles and San Francisco, and community activists are uniting to stop it.

The former don't want their single-family neighborhoods surrounded by apartment buildings, nor do they want more congestion. The California Dream drew me to Southern California from the Midwest 20 years ago. But as the state grows, holding on to that low-density, suburban vision means depriving younger Californians of their shot at the dream.

By contrast, urban activists fear that these loosened development standards will further gentrify their neighborhoods by replacing older buildings housing lower-income residents with upscale condos that bring in wealthier people. These groups tend to dislike anything that helps those dreaded "developers," even though more development is exactly what's needed to lower the state's housing prices. Both groups are using government to keep others out.