It's not really a non sequiter pointing out that the original meaning of the words has evolved over time. If the argument is to be made that the only purpose of government is to protect rights, and it is a good argument I agree, then just what constitutes protecting those rights has to be addressed. When the words were written, some of the populace had no rights. Moreover, technology has changed, the country has grown, and so the necessity of protecting rights has also changed.That is what's called a 'non sequitur'. Your reference to racial inequality, certainly a staple of society at that time, is simply misdirection. What you say is true, but it has nothing to do with the discussion. It isn't the words that have evolved, but rather, our willingness to apply them to certain parties. If you closely study the writings of that time, there were many who actively supported the application of those words to all humanity, not just white landowners. Political expediency forced a compromise.
I would disagree, further, that the evolution of those words to mean all mankind has infringed on individual rights. IF you mean that, coincident to that evolution, we have willingly given up some of our individual rights, that is true. But, I'm not sure just exactly what individual rights I relinquished in order to pay for roads, police, and fire protection. There is a significant difference between me agreeing to buy security or roads from the government, in exchange for my tax dollars. Arbitrarily taking my tax dollars, with a concomitant return to me, is a usurpation of my rights, but that is a relatively new phenomenon - starting with FDR. The current regime has merely raised that usurpation to an art form.
There has been, I will agree, a wholesale attack on our individual rights as the government continues to try to gobble up power, thus protecting themselves from the individual. Federal assumption of the local school system is an excellent example.
You must remember they can only do what they do with the tacit approval of the other party in the contract - you. If you don't make them stop, then you are complicit in the theft.
For example:
When a corporation gets so big and powerful that it can control a segment of the marketplace, is it a legitimate function of government to control it so as to protect the rights of the people who depend on that marketplace?
Do our rights need to be protected from the actions of the big banks?
How about from the actions of people who use the roads we all pay for?