Can a comic strip with a moral about empathy be humorous?

Yes, empathy can be humorously depicted. For instance, one friend tries to cheer up another who is sad about a minor mishap (like a dropped ice cream). The 'cheering up' attempts might be comically over-the-top. The moral is learned when the sad friend eventually smiles, not necessarily because of the grand gestures, but because their friend is genuinely trying to understand and be there for them.