Rather than a blame game, how can risk of future tragedies be minimised.
One way to minimise future war crimes is to ensure that those who are blame are brought to account and face severe criminal penalties.
The feeling of immunity from prosecution for war crimes in the International Criminal Court is quite certainly a factor in the mindset of the type of people who perpetrate such atrocities. If they thought they would face a a life imprisonment term for their actions they might apply a bit of self-restraint when attacking the environs of a hospital. Then that might, just might, dissuade them from committing the crime.