If someone genuinely wants to understand why open sexuality is more frowned upon than violence .
Religious rules around sex are bronze age relics conceived to assuage male insecurity about competition for female attention. The same mindset views violence positively as a male virtue. Thats why "open sexuality" is viewed more negatively than violence.
It can always be understood in terms of male insecurity.
That is certainly the popular mainstream opinion.
I would suggest that the more you consider human nature and pay attention to the breakdown of societal values the more you'll start to realize that the consequences signal an overall decline.
In a handful of decades the nuclear family has been more than decimated. It is a splitting of the basic social unit, as devastating to society and culture as the proverbial splitting of the atom.