No. That was not the idea. The idea was a media event where journalists and mothers get killed. That is why they loaded them on a bus and had it drive at midnight at the base that 50 soldiers were guarding. You claim that the fire was opened because of the colorado beetle ribbon the driver was wearing, but this is ridiculous. No one could see this small detail at midnight. Handlers knew what is going to happen if you drive a bus at the military base at night considering what the situation in Ukraine is now.
PR was part of the plan for the rebels for sure, regardless the consequences.