@OP:
Those before me have raised interesting points and while I do not ascribe to the simply good and bad schools of thought, I may entertain your premise with a few hypotheticals of my own:
Let us assume vegans become masters of all and to use animals for food is forbidden, it never occurs, no human eats their meat or milk or honey. Now... will there be people who say it is immoral to eat plants, to cleave through their stems and consume their flesh, pulped raw or cooked, as well as their seed? I think this is what you are getting at with humans finding new 'bad' things. Auburn's infinite resources then comes into play here.
In truth, the situation you describe is already partially in effect: With assault, rape, disease and so forth being less of a thing in many countries compared to, say, 1639, humans have already found new things to complain about and new ways to squabble with one another(or old ways over new things for that matter). Whether language use, ideals or simple differences in opinion, the 'bad' you see in others can be construed in a myriad of ways.
A pepsi drinker may see a coke drinker as bad, a juice drinker both of them as vile... see here fans who laud the superiority of their chosen technology, their belief clashing with those of others.
There will always be this contention, and in a perfect world one consumer may hate another because they prefer the green blanket over the polka dot one, or listen to Generic Artist's music more than Robotic Derivative's. Or even smaller things, like your brother spending too much time in the bath when you want to groom your mustache and adjust your bra, breeds the good vs bad state of mind.
Short of complete alteration of human brains, millions of years of evolution, lobotomies, or a governed singularity, humans will always find grounds of contention no matter the laws in place or the absence of the 'worse' (cannibalism, baby juggling etc.)
I don't think laws are made that way. Instead of incrementally criminializing everything that does not appeal to our senses, we ask ourselves what kind of soceity is a good one. As long as we value things like freedom and freedom of speech, the laws have to accommodate that.
A good point, two themes on my brain atm: North Korea and Singapore. Both are examples of areas where laws govern a lot, and while Singapore is more conventionally utopian(safe, neat, punctual,'green') , I despise it for the cameras everywhere, the banning of dogs from the public sphere(except in prams) and a myriad of other small laws(chewing gum fines, no smoking here and there and there) which convinced me how utterly boring utopian ideals can be.