I mean, percentage wise it's likely the majority of jobs in software engineering are in fields where people won't get killed if things go wrong. Very few people die because a website goes down, a video game or desktop program has bugs in it, or most businesses lose a bit of money/have downtime.
Yes there are definitely fields where people could be killed if things go wrong, perhaps in software for cars, planes, spacecraft or medical devices. Or for dangerous fields like logging or mining, or the military.
But I suspect the ratio of people working on software that's mostly/entirely harmless compared to software that has lives on the line is probably like 80:20.