Sometimes it's warranted, sometimes it's not. For example: I think it's fair game to discuss and directly compare Biden and Trump on the issue of sexual assault. A meme simply attacking Biden over Tara Reade lacks proper context.
It's fair to an extent to compare Trump's coronavirus response and Obama's H1N1 response, though the diseases themselves are pretty different and demanded different proportional responses.
However, bringing up Benghazi or whatever in response to criticism of Trump's coronavirus response wouldn't be proper.
Look for an apples-to-apples comparison.