As a family member of a registrant I can only tell you that these laws and registries are just an extension of a sentence and do not allow these folks to get on with their lives, they are not allowed to rejoin society regardless of the crime and continue to be punished forever.

Drug offenders who do just as much harm to a child and are in and out of prison and go right back to it, and DWI drivers who also can harm children neither face a registry – people can live right now door selling drugs to kids daily and yet that is ok – but people who have one of the lowest rates of recidivism – those people you want to punish forever – I can understand if there is a multiple arrest rate on someone to add on a private registry – but to punish those folks who are either caught in something without knowing – or who have a one time offense they deserve a chance to get their lives back – and you just want to punish them forever.

No other group of offenders, including murderers, arsonists, those who commit violent assaults, etc., is subjected to the draconian restrictions of being placed on a public list. No other country (with the exception of North Korea) has a public list, although many countries law enforcement agencies maintain nonpublic lists.
Over 95% of new sexual crime is committed by persons NOT on a registry.
http://psycnet.apa.org/record/2008-18509-003 https://www.ncjrs.gov/pdffiles1/nij/grants/231989.pdf page 15 https://www.researchgate.net/publication/232505213_Does_a_Watched_Pot_Boil_A_TimeSeries_Analysis_of_New_York_State’s_Sex_Offender_Registration_and_Notification_Law
Public urination, sexting, underage sex, and indecent exposure can trigger a requirement to register.
https://www.hrw.org/report/2007/09/11/no-easy-answers/sex-offender-laws-us third section
Many registrants face unemployment, homelessness, instability, and personal danger.
http://journals.sagepub.com/doi/abs/10.1177/1043986204271704?journalCode=ccja ; https://www.ncjrs.gov/pdffiles1/nij/grants/231989.pdf page 9
Only a small fraction of those on registries are truly high-risk.
https://www.ncjrs.gov/pdffiles1/nij/grants/231989.pdf page 11
Stranger-danger is rare; 90% or more of victims know their attackers, higher for children.
https://www.rainn.org/statistics/perpetrators-sexual-violence https://www.innovations.harvard.edu/sites/default/files/105361.pdf page 7
Re-offense is rare. The DOJ has reported a 5.3% re-arrest rate, and a 3.5% reconviction rate after 3 years.
https://www.bjs.gov/content/pub/press/rsorp94pr.cfm https://www.ncjrs.gov/pdffiles1/nij/grants/231989.pdf page 7
Research studies have found no relationship between having a registry and a decrease in sex offenses.
http://psycnet.apa.org/record/2008-18509-003 https://www.ncjrs.gov/pdffiles1/nij/grants/225370.pdf pp. 7, 41
Sex offender registries put innocent family members of registrants in harms way.
https://link.springer.com/article/10.1007/s12103-008-9055-x https://www.ncjrs.gov/pdffiles1/nij/grants/231989.pdf pages 9-10
Registrants are frequently denied special housing such as nursing home care and section 8 housing.
https://www.theatlantic.com/health/archive/2017/06/aging-sex-offenders/528849/ http://scholarship.law.marquette.edu/cgi/viewcontent.cgi?article=1386&context=elders
Former sex offenders are less and less likely to reoffend the longer they live offense-free.
https://www.hrw.org/report/2007/09/11/no-easy-answers/sex-offender-laws-us http://journals.sagepub.com/doi/abs/10.1177/0886260514526062 https://ofm.wa.gov/sites/default/files/public/legacy/sgc/sopb/meetings/board/2015/10/research_outline.pdf https://www.eff.org/files/filenode/024_hanson_decl_11.7.12.pdf
Current sexual offense laws create conditions that lead to increased crime.
https://qz.com/869499/new-evidence-says-us-sex-offender-policies-dont-work-and-are-are-actually-causing-more-crime/ https://repository.law.umich.edu/cgi/viewcontent.cgi?referer=https://www.google.com/&httpsredir=1&article=1078&context=articles