It would not be acceptable to make light of the suffering of 19th Century slaves.

Les asked what we made of the programme.
I reported an item that touched me.
Sorry.

It was a long time ago, but the Viking raids on peaceful communities were evil.
Arriving in sudden, overwhelming force they slaughtered indiscriminately, carried off women and children into slavery, took food stores and anything of value leaving any survivors to miserable starvation.

Does compassion have a time limitation?