I agree that the gov't doesn't do a very good job at a lot of stuff. But I don't see a whole lot of charity work that is very well run or effective either (Bill Gates is the exception).
And without looking back at what you posted, I think you said that if the gov't didn't provide immunizations to poor kids--you would. Well, I assume that if you are so charitable, you'd already be doing this. And even in doing your part, I am sure you recognize how much really needs to be done--even charity and gov't together can't seem to get everyone covered.