I think everyone agrees that observing live virus in the lab is a critical (if dangerous) part of studying them.
Intentionally engineering them as high as possible on transmissibility and morbidity is bioweapon development being money laundered through conventional science: it’s an insane thing to do.
Leaving SARS-COV-2 out of it completely: there have indisputably been other leaks. It’s the height of irresponsibility and shortsightedness to engineer civilization-ending viruses, which is why it’s banned under multiple international conventions that GoF is a workaround for.
You don’t need a vaccine for the fucking superflu if you never develop the fucking superflu.