Language evolves, words start by describing something, to become euphemisms for something else, to become swears, to end up as a description of the swear, and ultimately get either reused as a description of something else, or fall out of use.
Sounds to me like “lame” or “dumb” are quite far gone on that progression, to the point of becoming detached from the original meaning for most people. It’s great to avoid using them with the slur meaning, or in presence of those who understand it as a slur… but spreading awareness of, or teaching, the negative meaning to people who might have never encountered it, sounds like pushing the progression backwards, entrenching the word as a slur even among those who don’t use it as one.