The label of secular humanism is a code word bandied about by those who equate humanism only with anti-theistic practices. Certain of modern-day humanists may have an agenda to stamp out religion, but, as is often the case when labels are adopted and a different meaning attached to them (other examples include liberalism, elitism, and conservatism), the meaning of humanism is considerably more complex than most realize. The term dates from the end of the Middle Ages and the beginning of the Renaissance, and has undergone quite an evolution with regard to definition and emphasis since that time. The expression secular humanism is a rather modern invention of the political domain, whereas ethical humanism has become a moral variation of the term. The word “secular” also has taken on a negative political connotation, whereas originally there was no such pejorative sense attached to the term.
It’s certainly worth remembering that humanism had its origins firmly within the dominant Christian paradigm of the Renaissance (please forgive me for using such an unashamedly posmodernist term as ‘paradigm’, by the way). Furthermore, not all atheists and/or secularists are humanists, since humanism, by definition, places humans at the moral centre of the world.
What most people overlook in internet discussions about the relative merits of religious and irreligious societies - particularly those who point to the totalitarian regimes of the likes of Hitler and Stalin - is that the latter are no more rational than those who place the supposed desires of supernatural beings above the needs of real, verifiable beings. Replacing a theocracy with a communist or fascist state is not a matter of exchanging supernaturalism for rationality - it is only replacing one form of oppressive fanaticism with another.
Okay, that was rather off-topic, but I thought I would get it out of the way before addressing what seems to be the real issue. The OP’s follow-up question about risking bodily harm to stop what was going on - is that really the kind of response you were looking to receive? Do you imagine that this highlights a defining difference between believers and nonbelievers? That believers, perhaps, would throw themselves into the fray with no thought for what harm might befall them, since they believe they will be rewarded for a futile act of supposed heroism that may very well get them killed, and not actually do any good? I’m sorry if that sounds harsh, but to be honest, I don’t really see the point in an action that would only result in two dead or critically injured people rather than one. I thought my response made it clear that a situation like this is not necessarily a reliable barometer of any person’s ethical stance - none of us can know what we would do in a seriously threatening situation until we’re faced with one. Sure, I could say, “Yes, I would confront the attacker, thus putting myself at grave risk just for the sake of doing something rather than nothing,” but first of all, I don’t
know that I would; secondly, again, such an act of bravado might not actually do any good to anyone involved - it might only give the attacker an ego boost to put two people on the ground instead of one. And as far as the ethic of reciprocity is concerned, yes, there are some things I would like others to do for me in such a situation, but risking their lives is actually not one of them.