Talking about moronic when you parrot a dbz fan meme/common misconception as if it were fact is the most ironic thing ever
I'm not parroting anything, I can think by myself. And more importantly, I can comprehend a story properly, sorry if that's not your case. Goku crying, along with the assassination attempt, made him crazy. Even if him being stabbed made it a bit less moronic than it would have been otherwise, him remembering the crying, identifying Goku and targeting him for that reason is super dumb.
If there's a piece of fiction I have nothing to learn about from anyone, it's Dragon Ball, so I advise you not to try. Just say you disagree and leave it at that.