What's up with people throughout reddit deleting their comments almost immediately after posting?

I see [deleted] all the time on reddit. I understand people do this, what I don't understand is why? Don't they realize you can just look up who and what was initially posted? Why go through the trouble of doing this. For example:

https://www.reddit.com/r/changemyview/comments/kejlhw/cmv_the_us_turning_a_blind_eye_to_its_own/

This could have been an interesting conversation but the person stopped commenting within an hour and then literally deleted everything. Why go through the trouble of deleting everything when you could just... not? Even if they have no intention of commenting anymore, it's so strange to me.