> The role of government is to clean up the outliers who act out against the wishes of the people, not to "do good"
The democratic state exists to represent, protect, and promote the welfare of the people. The idea that governments exist to "clean up the outliers" (side-stepping the worrying phrasing of that) is a 'small-c' conservative mindset, not a liberal one. No, the democratic government exists to do what the people elect it to do. The reason why ostensibly democratic governments so often disregard or even act against the wishes of their constituents is because that democracy is not really as democratic as it would like us to believe (eg: gerrymandering). Also corruption, which is arguably included in the previous point but best to make it explicit anyway.
> you start volunteering to build houses [...] as anyone who cares naturally would
I love the naive frivolity of the idea that people can just volunteer to build houses as if there's no training, zoning, insurance, regulations, etc, involved. Sure, I could make the teas and coffees, but like, you seem to think this is something people can do to fix the housing crisis by themselves. So how will people do the plumbing, wiring, structural analysis? Ensure the foundations are correctly laid? That walls are not out of plumb? You just hope that this effort that people make in their spare time will have all the planning permission and trained professionals enough to get this done? Are you for real?
> It wouldn't be the government's job to force you to start building houses
Okay, literally who? Who is being forced to build houses? Even in countries with public housing policies, who is being forced to build houses? The only thing I can think of that's remotely close to this is when development contracts include requirements for nearby affordable housing developments. I have no idea what you're talking about and I honestly think this argument is a complete strawman.
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You are obviously an authority on yourself, but are you really a liberal? You certainly not making liberal arguments, and not in a "hurr durr, that's because I actually want to get things done!" way, but in a wholesale rejection of systemic solutions to societal problems, the dismissal of the idea that the state has any responsibility to promote the welfare of the people, and the notion that public programmes that would promote the welfare of the people would force people to labour against their will? These are conservative talking points through and through, and I think you should reflect on that.
But again, we are just bickering in a side discussion: the real discussion is about why liberals are less happy compared to conservatives. I've made my claim, you've seemingly agreed with that claim. We needn't continue this gratuitous back and forth about whether the state can and should attempt to benefit the people outside of "clean up the outliers".