I believe you are incorrect. HJPEV didn’t yell about the False Memory Charm until after the doors closed. Hermione has no reason to believe she did not attempt to kill Draco other than her own sense of her own character. And the text as written does not indicate that HJPEV had any success at convincing the other students. He just yelled at them a bit. Only a few heard him and the only response that was dismissal.
I believe you are incorrect. HJPEV didn’t yell about the False Memory Charm until after the doors closed. Hermione has no reason to believe she did not attempt to kill Draco other than her own sense of her own character. And the text as written does not indicate that HJPEV had any success at convincing the other students. He just yelled at them a bit. Only a few heard him and the only response that was dismissal.