Although I find it keenly interesting I'm sorry if you or anyone else feels personally attacked by my discussion of the coincidence of tattooing with problematic behavior but there are dozens and dozens if not hundreds of not-rubbish scientific studies conducted regularly for over a century that so consistently establish it there's really no debate that it exists.
The most current study publicly available on the topic, quite appropriately for this case based on data by the Cambridge Study on Delinquent Development (a study of British men like our suspect) while acknowledging and citing over 70 other studies corroborating the association of tattooing and a plethora of antisocial behaviors this particular subject goes to the additional measure of collecting a matched sample of untattooed individuals that match certain psychological characteristics and concluded that there is not a causal relationship between tattooing and criminal behavior, their research "suggests that personality traits (e.g., individual risk factors) assessed in early childhood such as daring disposition, low nonverbal intelligence, nervous/withdrawn, extraversion, neuroticism, and psychomotor impulsivity, are associated with both tattoos and crime over the life-course." (Jennings, Fox, Farrington 2013)
Inked into Crime? An Examination of the Causal Relationship between Tattoos and Life-Course Offending among Males from the Cambridge Study in Delinquent Development - ScienceDirect
I invite you to read this relatively succinct research paper and especially to look over its own exhaustively cited sources. I will specifically say that I have not personally read any research whatsoever regarding tattoos on women as it does not relate to the topic of this thread and that any personal remarks I might have made about any specific user's tattoos and
especially any woman's tattoos are entirely casual and conversational based entirely on my own personal reflection.