Same reason I’m forced to live with a Conservative led government. That pesky democracy. All the same, I’ll take it over all other alternatives.
To @Saint-or-sinner’s question, it’s partly both, but it’s mostly those that have formed various governments over the years. Most of those governments, in addition to implementing new policy, also fought cultural wars to change the way we think, change our relationship with power.
Thatcher not only promoted individualism, but also went on a crusade to reduce the power of collective bargaining, where actual battles were arranged and fought. She knew that workplace unions gave most people of that class their first taste of politics, many of them becoming highly effective politicians for the opposition.
Blair’s big domestic gamble was to waive the seven year wait for workers from the newly acceded member states. He and Mandelson were convinced that it would create more Labour voters, and that the result would be a United Kingdom that always voted Labour. Instead, he merely fuelled the rise of UKIP, never realising that migrant workers were more interested in earning a few bob than UK politics, never realising the effect it would have on their base.
The Conservatives deserve more criticism, mostly because they spin their own failures into attacks against specific communities.
And yes, you might say that the people can change all this. The problem is that people don’t know what kind of change is possible, and in most cases, are actively reminded of fabricated constraints dressed up as universal constants, such as the fractional reserve banking system.