I think someone mentioned upthread - there are folks who are so against electric vehicles (and the people who would choose to drive them, I suppose) that they vandalize/damage public charging stations.
And sure, everything breaks from time to time. Some are better made than others. And the industry is new, so there are no tried-and-true designs out there. So, yes, sometimes someone has to go and fix them.
Broadly speaking, charging stations are usually part of networks - over time, the networks that are better at placing and maintaining their stations will win out.
And, since they are part of networks, there are apps that will tell you when a station is out of order or occupied, before you go. Some of them allow you to reserve a station, as well.