They wouldn't allow just any employee to "fix" these issues. Too often there is a lot of context that is omitted from the shared story, so it's not just a matter of hitting a button to remove a block.
[At a party] A: What do you do? B: I work for $BIGTECH. A: You suck dude. I bought one of their products and it never worked once.
Bigger companies seem not to care that much, apart from maybe twitter? And those few thousand upvote posts on reddit.
People on HN are not really strangers, we are part of a community. By helping one of us, they help one of their in groups. Not helping might devalue their investment in this place.
HN users are the early adopters that small group of users who have much more influence early on in projects. Care of early adopters makes sense.
When the coin in the coffer rings / An account from bannination springs!
Also, "I helped a member of the public defeat my organisation's policy" is a negative on the resume not a positive. Sadly.
Of course there is a discussion to have about incentivizing the _wrong_ behavior (the need to create publicity around issues that shouldn't exist in the first place / only people with "clout" become the ones who get their issues resolved).