Edit: it occurs to me that this characterization of "just doing what the people wanted" is probably completely wrong anyway. I'm sure there was never a public meeting in Flint, for example, where city officials stood up before the public and laid out the plan to switch water supplies and the subsequent poisoning of the entire city that would result.
You can certainly blame the public for electing incompetent or corrupt public officials. Said officials also shoulder the blame for fucking up the water system. That they would be fired for doing the right thing does not absolve them in the least.
I'm not saying you can't blame the people for who they choose to govern, merely that the people who govern are also to blame.
The situation for Flint specifically is complicated by the fact that the city has an emergency manager appointed by the governor. The elected council approved the decision to switch as well, so the locals aren't free from responsibility either, but there's plenty of opportunity for finger-pointing in many directions.
So, rather than it being a "the people have spoken" situation, I think that the situation is driven by constraints on public attention for political issues. I don't think you would get many voters endorsing continued poisoning of the population when a marginal increase (or reshifting) of taxes could address the issue. Rather I think that it is rarely ever politically advantageous to spearhead these kind of issues (that is until it explodes into an attention grabbing crisis, as is now the case with Flint lead poisoning).
We can see this sort of thing in microcosm in office politics as well. How often are we complaining about always being reactionary and putting out fires instead of proactively taking care of problems before they can cause a lot of damage? Well, once a fire starts, everyone is keen to figure out what's causing it and how to deal with it. But recognizing the pre-conditions that could potentially lead to a fire, and then eliminating them sound much more boring[1], and often requires a concerted information campaign just to get people invested in supporting the mitigation. But if there's an actual [2] fire, people are immediately interested by the inherent drama of the situation, and attention is no longer a barrier to overcome.
[1] even that description of it sounded much more boring than the bit about fire! [2] an 'actual' figurative 'fire'. I know the wording is sub-optimal, but I'm pot committed to this metaphor so...
When you fail to communicate the urgency of replacing dangerous pipes to your electorate, you're (at best) incompetent.
In that case privatisation can work because it removes short term political incentives from the equation. Corporate structures enable investment and charging what is needed - plus things like water conservation ironically are often pursued more by those with financial stake in the game.
A private water utility can be sued into oblivion or killed by regulators over lead issues - yet a public system gets some soul searching articles that still mostly manage to blame capitalists while ignoring the failures of regulators. "Better regulation" is hard to achieve, but America in many ways seems to be truly shocking in how poorly regulated many areas are.
Now that we've stated the obvious, it shouldn't be too hard to agree that "privatise everything" and "cut all taxes" is an extraordinarily stupid way to vote. Flint is evidence that some things are too critical to be privatized.