he knew they were able to evacuate
That never made much sense to me.
The agent released into the atmosphere was said to make the planet "uninhabitable", meaning it must be rather potent stuff. We don't know if it's immediately lethal or only harmful in the long term, though.
However, consider this. Even though Sisko did tell Eddington to start preparing for evacuation, it's rather certain Eddington did no such thing. Yet the very minute the trilithium is released, the Maquis (or the people Sisko claims are Maquis) start scrambling off their planet. Why?
Did they detect trilithium in the atmosphere with their sensors? Rather unlikely that they would have such sensors in readiness in the first place. Did they listen to Eddington's chat with Sisko? Rather unlikely that Eddington would have been transmitting anything forth to the planet. So why scramble?
It seems to be that the only reason an entire planetful of persistent and brave people would abandon their world is if they saw and felt the effects of the trilithium, and that those effects were really serious and obvious to the layman. Which more or less means that it was already too late for the first victims.
Sisko had picked the nearest "Maquis colony", not a special colony that would have some a priori reason to stand in readiness to evacuate. How realistic is it for an entire planetful of people (hundreds of thousands by Eddington's possible but unlikely hyperbole) to be within a few minutes of their starships? Or even within facilities that will protect them from atmospheric contamination until they can be taken to starships?
It doesn't convince me in the slightest. If Sisko only threw "tear gas", the colonists would stay put, hold their breaths and start firing back with whatever they had. If Sisko threw the counterpart of Eddington's deadly nerve gas, then he by necessity murdered thousands. Yet the way the episode pans out, it seems that neither of these happened.
...How?
Timo Saloniemi