Paine begins Common Sense at, well, the beginning. He sets out to explain why we in fact have societies and government. He states that we need society to positively provide for our wants. Solitary men can not provide the same way they can when joined together. Fair enough, sounds good. But then the trouble starts.
While society provides for our needs in a positive fashion, we need government to provide in a negative fashion. That is, men are not angels and therefore need to be policed. Government provides this function. It is an evil, as it is a limiting force, but it is a necessary evil as that limiting force can protect the liberty of others.
When the government ceases to be a protective force and in fact becomes a self serving entity is when problems arise. The worst part is we often do not even notice it happening until it is too late.