Despite everything that had already happened, there was still a sizeable chunk of the Second Continental Congress who thought that some form of reconciliation with England was possible.
Under their logic, the fact that there had been fighting at Lexington and Concord should have provided King George with ample proof that his policies were unpopular, and maybe he could back off on them a little bit.
In retrospect, we can see that this was rather short-sighted, and that those people truly didn’t understand the motivations that the English leadership had for their actions. Plus, England had history on their side: someone’s acting up? Squash them like bugs and get them all back in line.