I think there are victim-less crimes.
Prostitution when not forced and if properly regulated by the state to ensure the health of the prostitute. Yes, it can potentially spread STDs but so can casual sex or serial monogamy. Yes, there is potential for disrupting families but there is equal disruption from adultery, financial problems, workaholics, working 2 or more jobs, ...
Public drunkeness, yes it can cause death or brain damage but that is extreme situations.
Illegal drug use, more a social problem than "criminal act" within the traditional definition of a crime, which is why it was criminalized. Most illegal drugs were used for mystical/spiritual reasons or as old time medications. While not personally someone who chooses to take recreational drugs, when used as intended, under proper supervision, I do not consider their use criminal.
Suicide, depends on the reason. I can very easily justify suicide under a number of conditions. It is others with no concept of dignity, only a religious concept of suicide being murder, that would bemoan a departed that committed suicide. Most families are going to bemoan a death even if from pneumonia. Life is pain and suffering, some people for various reasons opt to end such pain and suffering. I do think suicide should be looked on in a favorable light but require counseling to ensure not just a phase of depression. If not a letter should be issued stating this person is sane and should be allowed materials desired to for chosen method of death. If we had this view, family members could try and change the person's mind, failing that accept the decision, and the everyone could say good-bye and express love.
Parking meter expired.
If one worries too much about collateral damage from a crime, then one must worry about collateral damage from such things as the truth especially blunt honestly ("You are fat.", "You are ugly", "You are not worth choosing for our team.", "You smell and are making people retch. (Yes, I heard it and Putzfrau it was said to, was being sprayed with air freshener by the speaker, one of my co-workers. He was verbally reprimanded.)", ...). Blunt honestly leaves victims and worse our society no longer feels the victims need to learn to deal with such rejection and hurt feelings.