I think Ukraine just doesn't want civilians to leave Kramatorsk to the east
People in the train station were waiting to go west. There are no trains going east. It would be absurd to evacuate towards the front line, of course people are trying to get away from the war.
And:
Kramatorsk local authorities were starting to evacuating residents by buses and cars, according to the mayor of the city Oleksandr Honcharenko.
"Today we are starting an emergency evacuation of people with all public transport, all private transport. We are looking for drivers. Approximate 30-40 drivers are needed as of today," Honcharenko said during an online briefing.
There is no sense in a false flag operation targeting a railway station in such an strategic location. It is a very valuable infrastructure that, at the moment is taking people west, but may also bring troops to the east.
If you wanted to further raise aversion to Putin's military there are targets without any strategic value and plenty of civilians. That is, if you are a total sociopath and this makes sense to you.
No, this was a planned attack to an strategic infrastructure and the fact that there were civilians was indifferent to the psychotic strategists in Putin's army.