When starting discussions / topics do not touch with factors that smell SARA.
probably only a few understand SARA, it is an acronym in Indonesian language
SARA stands for
Suku,
Agama,
Ras dan
Antar golongan
in English: ethnicity, religion, race, and inter-group relations
I think the equivalent term in English is Hate speech
wasting time on the same topic, in vain.
It would only be in vain if the thread presents no new discussion. A lot of people don't like replying on older threads when the discussion is outdated, and because most substantial users here will read from the first page on wards to catch up with the discussion older threads can sometimes be problematic if that information is now outdated.
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I agree, it is sometimes necessary to create new thread with similar topic of old thread
as long as the new thread has something new (of old topic) to discuss, I think it would be ok
and replying to an old thread even with new information may still be deleted

for necrobump reason