It think it says something that you'd be willing to jump to conclusions. You "learned" it was sanitised and make a point about people willing to alter the truth, then you personally attach some meaning to it. You made up your own reality, when the word "[people]" literally indicates that the OP did change the quote. Instead of assuming malice, you could have also just asked why they changed it, or looked up why words would be in brackets, or give the OP the benefit of the doubt.

If you selectively put words in [brackets] and remove others without adding ellipses you can alter anything to have any meaning.

I for one read this and assumed RFK was just discussing gun control in general, only weeks before he was killed. Adding in the context the speech was regarding MLK gives it a whole different meaning. Still powerful, but different.

Attributing “The only thing we [experience] is fear itself” to FDR suggests he said something a little different. That FDR needs to see a therapist for his anxiety.

This assumes facts not in evidence. While the posted quote is sanitized, the assumption that the poster did the sanitization vs. copying from a sanitized source isn't necessarily supported.