For better or worse, HR exists to protect the company. Making problems go away is what they do.

No one's advocating such measures. The "go away" implies that the claim was repressed, instead of fairly considered.

It implies the claim was withdrawn. It may be that it was repressed, but it also might be the person who made the claim in reality just wanted an apology or for things to stop, and that she managed to sort things out. A lot of the time personnel conflicts escalate because the two sides don't know how to resolve it between themselves, and a good HR person can make the problem go away simply by facilitating communication.

Now, if she really did make it "go away" by repressing a valid claim, then that's quite disgusting, but without more details we don't know whether or not this was anything bad. There's enough other icky behaviour described there's no reason to jump to conclusions about the rest.

Or just being held accountable for their actions.

Who says they weren't?