I think if a poster has an infraction, it will show up in his/her profile and won't once it expired.
Maybe I'm having different settings, but expired infractions are also visable in the profile for me.
(7) Do not start threads without substance or without anything worthy to discuss.
LOL! MTF is where people come to waste time and talk carp with other time wasters. Worthy discussion is the exception not the rule.
Stop getting ahead of yourselves. This is an internet forum, not the UN Security Council
Somehow right of course, we never can prevent all crap from happening and this can't be the goal, especially posts in threads. But we will more likely than not fight against threads which are deemed to be trash, stupid, trolling, etc. With these examples given, I think we tried to make it pretty clear what threads fall into that category and usually lead to nothing. However, I can't give you a formula.