We have a similar thing here but it's only for "deleted" topics and posts, which may have benefit for future reference for moderators and administrators (e.g. assessing member violations of Terms Of Service, and the counter to that, assessing complaints made by members about moderator interpretations of the TOS).
Locked topics, by the very nature of their being locked, will drop away in time.
"Do not force others, including children, by any means whatsoever, to adopt your views, whether by authority, threat, money, propaganda, or even education." - Ven. Thich Nhat Hanh
"The uprooting of identity is seen by the noble ones as pleasurable; but this contradicts what the whole world sees." (Snp 3.12)
"To argue with a person who has renounced the use of reason is like administering medicine to the dead" - Thomas Paine