He absolutely did have every right to make that comic. And his audience had every right to respond “Whahahahahahat the fuck was that?”
That was the intended audience for the comic at the time, though.
CAD was very much immature nerd humour (as was the style at the time), and it’d be inevitable that a sudden tonal whiplash to a serious tragedy around a miscarriage, out of seeming nowhere, would be received poorly.