The reason is most people and your repliers included are unable to identify their biases so they talk about violence but violence is not what actually repulses them or humans in general.
What repulses humans is gore. The more realistic the gore the more we're repulsed. All forms of violence depicted without gore is something humans are completely ok with.
The evidence for what I am saying exists in what we eat. The meat we put in our mouths come from violent houses of slaughter where we kill living things and slice them up for consumption. Most people are totally ok with this, they just don't want to see the actual animal getting killed. But the fact that we raise living things for the sole purpose of slaughtering them later is a something we're totally ok with.
It's not gore specifically that makes us repulsed. It's visually seeing gore that is something we're not ok with. As long as we don't see gore then we're ok with gore actually existing in real life. Nothing illustrates this concept better than video games. In video games and movies... No actual violence is occuring! It's just pretend violence. We're more ok with eating slices of flesh violently hacked off of from living things then we are of seeing movies depict fake violence, where no actual violence occurs!
People are unable to separate a response triggered by visual stimuli away from the actual intent of "violence" that usually is associated with such stimuli. In their confusion the mistakenly conflate gore with violence and as a result have a deep misunderstanding of human psychology in general.
Don't try to find logic behind your instincts and emotions. Things like "reactions" from visual stimuli do not exist because the make sense, they exist because such "reactions" at one point in prehistory helped humans survive predation. Making logical sense is not a prerequisite. That is the problem with your repliers when they try to dismiss your response, they are trying to make sense of something that never made sense in the first place.
Either way, congratulations for asking the definitive question and noticing what others are incapable of noticing.