I suggest every off topic replies should be either deleted or reported. Without this action people wouldn't learn.
Some people kept posting off topic simply because they want to attain merit forgotten things aren't done that way.
Nevertheless such post should be reported and deleted
As a newbie, I've seen several off topic replies and it does totally get a reader confused. I think the best way to address this issue is for the forum to provide platform(s) where this off topic replies can be reported so that such persons can be warned of the dangers of off topic replies and if a person is reported more than three times, such person can be sanctioned accordingly. It'll help in reducing the number of off topic replies in the Forum