From my own experience, and maybe because I wasn't among the "power" witnesses, I would say that many witnesses wanted to believe that God wouldn't just kill everyone. I myself thought about that quite a bit. But after awhile of trying to figure it out, you just shrug your shoulders because of course, God would never do something unrighteous.
There were also articles from the WT that gave wiggle room about who was to be killed during Armageddon. Like how it isn't up to us to read others hearts and that although the preaching work has reached many lands - the places where there are isolated indigenous people - well probably God wouldn't kill them because they may have good hearts. The biggest "get out of killing innocents" card is WE DON'T KNOW. This is very different from what was preached from the WT in the early days. They had that fire and brimstone attitude from the podium. Like anyone that dared not listen to us - Down They Go into Gehenna!
As they gradually realized that translated into regular JW's looking down on anyone that didn't take a magazine and not making an effort to convert them, it changed to "it's not up to us to say a person is a Goat!" Cause some did go around talking about how many "goats' were in the territory.