He also didn't think much of private property.
[1] http://press-pubs.uchicago.edu/founders/documents/v1ch16s12....
> Was he some sort of fundamentalist anarchist?
The quote plainly refutes that idea.
If you take someone else's property for your own use by force without their permission, they are perfectly justified in using force to take your property without your permission. That is the fundamental natural law which underlies property rights, as well as all other natural rights: reciprocation. It doesn't matter who the property belongs to, how much other property they have, or who is doing the taking.
If you take someone's property without their permission there are three possibilities: (1) you admit that it's wrong and deserving of punishment; (2) you claim that taking property without permission is universally right (i.e. that there are no property rights), in which case you can't complain when others take your property; or (3) you claim that rights are not universal, in which case others can claim the right to take your property just as easily as you claim the right to take theirs. Whichever path you choose, the act of theft justifies its own proportional punishment. The same reasoning applies to any other natural right, as they are all based on the principle of reciprocation.
This is neither the time nor the place, but if you're interested in a more complete treatment of the topic I would recommend this paper: http://www.mises.org/journals/jls/12_1/12_1_3.pdf
It doesn't matter whether or not I agree with you or Franklin (or neither) here - I was noting that your attempt at pointing out his "error" is itself logically flawed and does not demonstrate any such error on his part.
I should hope that this argument is not "unique", since it's just an application of basic logic, and I really couldn't care less whether the conclusions are universally accepted. The logic is sound whether you accept it or not.
I think this has run its course, it’s not a good media to get into something like this at depth.
Though I would agree it's a quote of triteness and "just so" convenience that gets massively abused.