Technically a hard fork could be used to removed content from the blockchain. It would still exist on the old blockchain though so as long as a copy of that chain exists it exists. It would not show up on sites following the majority chain though. It would take the agreement of nearly all the witnesses to do this though so it would have to be something major.
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Bingo. So problem ... solved? Sounds like the system might make it hard to do this.
Is that why we call it a hard fork?
No it's called a hard fork because it is not backwards compatible. Older versions of the software are forked off the network. A soft fork is backwards compatible.
Hard forks only become hard to do when there is disagreement on what the developers added and/or misinformation. Hard fork 17 on steemit would be one such attempt that failed when the witnesses were against all the changes the devs wanted. Bitcoin core/blockstream and their censorship spreading lies that the chain would surely split if the block size were increased would be a good example of misinformation and FUD spreading preventing a simple hard fork for years.