Why did Patrick Henry want independence?

It might be difficult for many of us to believe today, but quite a few American colonists were still committed to retaining a link with the mother country. But Patrick Henry wasn't one of them, and he used his famous 'Liberty or Death' speech to persuade others of the justness of independence and the overriding need to defend it through force of arms.
Henry tells his audience that the American colonists are already effectively at war with the British. That being the case, independence is a brute fact and must be acknowledged as such. Britain isn't serious about reaching an amicable settlement; otherwise, why else would she be sending her armies and navies to North America in such large numbers? It's useless to negotiate; the colonists have tried to make the British see sense time and time again, and yet have always been ignored or treated with utter contempt. The time for talking is over. The British are coming to take away our liberty, and the only way we can defend that liberty is by declaring our independence and then fighting for it on the field of battle. 
https://www.history.org/almanack/life/politics/giveme.cfm