If ever the road to political hell was paved with reformers' good intentions...

Not  surprisingly,  Michael Hiltzik has the essential explanation of how we got here.

Herbert Croly, one of the nation’s leading progressive political commentators, cautioned that progressive electoral reforms such as the recall and ballot initiative would be “instruments of minority rule and usually of the rule of a very small minority.”

Enacted in response to the “flagrant betrayal of the popular interest” that took place under the traditional political system, Croly wrote, these measures “may succeed in abolishing one kind of abuse and oppression, but only at the price of its being succeeded by other kinds.”

...

The year was 1914. Only three years before Croly’s warning, California had established the recall, initiative and referendum as tools of “direct democracy” at the behest of its newly elected progressive governor, Hiram Johnson.

In his 1911 inaugural speech, Johnson asserted that the three measures would “place in the hands of the people the means by which they may protect themselves.”

He meant protecting themselves from the abuses of the dominant political force in California of that era, the Southern Pacific Railroad. The SP had suborned almost every other instrument of political action: It chose candidates for public office and manipulated the vote to make sure they were elected.

...

Johnson had won the governorship through a head-on attack on the SP in a statewide campaign; now that he was in office, he intended to break its political monopoly forever.

Those who counseled caution in reforming the political system were shouted down by reformers, who were in their ascendance and had the depredations of the SP to point to.

...

As historian Tom Sitton observed, [reformer John Randolph] Haynes was confident that the reforms would inspire voters to “become informed enough on political issues to cast a ballot” on specific issues. Haynes “saw in these instruments a method by which groups with little power could ... compete with a plutocracy that he believed had corrupted American politics at every level.” With Haynes’ backing, the reforms were enacted overwhelmingly in Los Angeles in 1902.

...

Croly saw that the initiative would play to the interests of the most determined camp and that a motivated and vocal minority would often have the advantage over an indifferent majority.

“The right to force a vote on specific legislative projects ... which must be approved or disapproved as a whole,” he wrote, “places an enormous power in the hands of a skillful and persistent minority.”