Charity is good and government is necessary, but there is no essential connection between them.

I suppose it depends on what you see as "charity". For example, free childhood vaccinations can be seen as charity -- after all, why shouldn't people just buy their own vaccines on the free market ? -- but having a vaccinated population with herd immunity is, nonetheless, a massive public good. The same can be said of public education, or, yes, canes for blind people.