The minimum standard for a "sex offence" in the UK seems to include [0] "Sharing or threatening to share intimate photograph or film" and "Sending etc photograph or film of genitals". Which (1) don't do either of those things. Ew. and (2) In a practical sense they can be pretty harmless. Maybe a fine or a strongly worded letter would be appropriate in more serious cases.
So there isn't any problem, in the abstract, with some sex offenders wandering the streets.
[0] https://www.ons.gov.uk/peoplepopulationandcommunity/crimeand...