I may be dumb, but why does reddit have long chains of deleted comments?

Why does reddit often have at least 1 semi long thread with all of the posts deleted?

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Haven't been on Reddit for a few months but usually that happened in subs with strict rules on staying on topic / being serious like say /r/science. So a top level joke would lead to that whole comment thread being deleted.
- r/askhistorians were great for that.
  
  Huge chains of lulz deleted (you could get that shit on any sub) but the several hundred word, amazingly detailed answer was the reason to visit askhistorians.
  
  They at at least did it for a reason and their rules were clear. On many other subreddits comments would get arbitrarily removed just because the mods don't like them.
Also I could add many who are leaving reddit have deleted their accounts and all content they posted. Not sure if that's the case here but maybe?
- Its a reasonable theory. altho it sounds like it would create partially to mostly deleted comment chains and only occasionally fully deleted ones. (Im not on reddit anymore and have npt looked at their comment sections lately. If i missed somthing, let me know)
Because of power tripping janitors. See for instance any thread touched by awkwardtheturtle, the misandry-spewing cryptid who hates men because their ex-wife transitioned to male.
- I don't get why they didn't put a hard limit on how many subreddits a person can mod

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