It's because they weren't protesting taxation; they were protesting taxation without representation.
Given the outcome of the drawn out century of warfare the Brits waged against the fledgeling republic, perhaps they should have seen fit to raise further funds, though it's unclear what would have cut it.
The most justified role of a state if there is one is to fend off foreign invaders in order to defend property rights, and ultimately, while it held out for awhile, the American government failed at that in the 1912 election of a British sock puppet.
