I just wanna say, that Luffy decided to punch a celestial dragon in the face and immediately his crew paid the price and they would've been obliterated right then and there if it wasn't for Kuma conveniently being an ally.
We have a connection to Ginny because she's actually named, but do you think she's the only member of the Revo army that got killed/captured in their fight against the WG?
They know the risks. They know the prices.
Doesn't mean they don't care. Chapter specifically says they started going more agressive following Ginny's kidnapping.
Remember what Luffy said to Vivi back in Alabasta.
It's sad. It's tragic. But it isn't enough reason for Dragon and the rest of the Revos to throw away their entire fight for the sake of "payback" or "rescue".
Even the infiltration into Mariejois took time and planning. Even when Sabo was itching to go batshit crazy and rescue Kuma, the other commanders told him to chill and act according to plan so their chances of success would be higher.
The Revos aren't a group like the SHs. They are a revolutionary movement that is trying to deeply change the status quo by going against the WG, the, as of now, greatest force in the world.
So chill.