But here comes the point, when is it "intentional c&p"? And in my humble opinion (intentional c&p) is what needs to be judged/banned.
How is it of any use for the forum if a member with 2000+ posts and 50+ merits over the course of 2 years or more will be punished for 2 or 1 mistakes (even if the forum-rules have to be respected) done anytime in the past?
Is any comparativeness given with 0.05% posts are to judge according to the rules?
It's almost never "2 or 1 mistakes" and it's almost never "mistakes". Appeals and sig bans can handle such rare cases but 99.9%+ of it is clear-cut copy-pasta BS. The fact that you see 1 or 2 messages presented as examples when the perp asks "show me what I copied" doesn't mean that's all there is.