Plagiarism is not a sin, nor a little mistake, it is simply against forum rules.
(Hypothetical example)
User x plagiarized 5 years ago and it was his 5th post at that time.
Current status-
Activity: 2798
Merit: 3925
Posts: 13411
Especial note: This user helped good number of forum users and he built up a good name for himself.
Decision timeWhat will you do?
Enforce the forum rules!
My personal stand: I will not enforce the rule. The user is a gem for my community.
Explanation: When he was new here, he did not realize the value of the forum so he made sin/mistakes here and there. It's forgivable.