The right for your to defend yourself is definitely a social construct. Because, if you live in a society that denies you the right to defend yourself, and imposes punishment on you for doing so, then it would seem you lack that right? Your right to defend yourself, and for their to be community moral approbation to you doing so, seems like something that requires social construction, ipso facto. By definition, any "right" you think you have that requires action or restraint by any other human, requires that other humans socially agree with you. If they do not, then you can pound sand about your rights, while you're jailed or executed.