Recently, I read the following thread:

https://bitcointalk.org/index.php?topic=5104259.0

...and felt bad for its OP. It looks a bit harsh and cruel to permanently ban an account for spamming, plagiarism, or whatever the (similar) reason is. It's like a lifetime prison! Even if the thief is caught stealing, it doesn't give him a lifetime imprisonment, instead he's freed after 2, 3 or 5 years. Why can't we apply the same rule here? Most stupid people won't understand anything without a ban (no matter how many warnings they are given). However, going for a lifetime ban for this still looks very harsh.

IMO, lifetime bans should be replaced with something like 90-days ban. This much duration is enough to make someone realise the mistake!