Your arguments seem to be predicated on the idea that arbitrary social conventions are worth more than coherent principles. The history of this country shows the opposite: as time goes on, we achieve progress by discarding such conventions in favor of better adhering to the principles we claim to respect. The idea that social change should require "consensus" simply is not supported on either a psychological or a historical level, as shown by the many examples I've brought up in this post and elsewhere. There is a tipping point for social change, but it's the point at which lightning strikes the ground, swift and momentous, forcing the eye to adjust; it's not the gradual sunrise, the sky becoming gray and then growing imperceptibly brighter from one second to the next.