Don’t at least some really bad people deserve to go to Hell?
No. Even if God were of a mind to get back at those who committed wrongs in this life for which they never seemed to suffer in kind, even the very worst person who ever lived, given all of eternity to be “paid in kind” would eventually feel exactly the same degree of pain as what he inflicted on others for the exact same length of time. Therefore, the day would finally come when he would complete paying “an eye for an eye,” as it were, and would have to be released from any further suffering. For God to cause him to suffer one bit more would be unjust! Perhaps this makes a good argument for the Roman Catholic doctrine of Purgatory, which is temporary, but not at all for Hell which is alleged to be eternal.
