That really depends on the mechanism behind stuff like time lines and time travel.I'm not sure I buy that on a philosophical level, because it turns all utility calculations ("is this on net good or bad") into weird equations with 'infinity' as the inputs on both sides. Anything I do can be interpreted as creating the timeline in which that thing happened, and destroying the timeline in which it didn't. If altering a timeline and replacing it with one in which different events happened is universal genocide, everything is universal genocide.
The only ways to parse this are to not view a timeline alteration as being universal genocide in the first place, or to view it as such but then say that bringing a new timeline into being is an inherently good act just as undoing the old timeline is an evil act.
To use AGG:Rise as an example, timelines are singular, no branching from beginning to end. Making a choice isn't choosing between potential timelines, it's determining where the timeline is going. However, altering the past can be evil, depending on how far back and expansive it is. The PC has that ability, and usually uses it to either retroactively stop something that happened a few seconds ago(such as a attack destroying an inhabited city), but also has the ability to make more drastic changes to something by altering an events in it's past. The two times it's been used, he reset someone that had been driven insane back to right before that, and reversed a nasty case of possession. In both cases, he effectively killed his target, which can be seen in the first case by the previous version emerging from their insane self's corpse.
However, a big part of the setting is a character time travelled back to the past to change the future, and this killed all of reality and replaced it with a new one. And this isn't hyperbole, as this event, which is described as killing "infinite lives" ended up spawning being fueled by the wishes of those being to live, who seeks to erase the current timeline.
Or, to put it simply, the effects of altering the past are essentially identical to destroying something and transmuting it into a past version of itself.
However, a big part of the setting is a character time travelled back to the past to change the future, and this killed all of reality and replaced it with a new one. And this isn't hyperbole, as this event, which is described as killing "infinite lives" ended up spawning being fueled by the wishes of those being to live, who seeks to erase the current timeline.
Or, to put it simply, the effects of altering the past are essentially identical to destroying something and transmuting it into a past version of itself.