Why is big business so interested in left-wing politics?

Numerous commentators have noted how the Irish marriage referendum was influenced by big business, especially Californian-based companies like Google. It’s one of the curious trends of recent years that big business, once considered the enemy of ‘the Left’, is now its greatest proponent; or at least the dominant strain of Leftism, social justice liberalism.

Silicon Valley is the most extreme example of this, an industry that is young, dynamic and universally socially liberal; but elsewhere most politically interested billionaires in the West tend to be more liberal than the population, whether it’s George Soros funding various social justice causes or other Democrat-supporting...