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This might clear it up, they mentioned the kings and goverment aren't the Revolutionary Army's opponents, only the Celestial Dragons are. Basically the goverment itself is fine, it's only the Celestial Dragons that currently rule said goverment need to go down.Dragon is one of the most intriguing characters of the manga for me ever since his first appearance. But between this and the recent weird "oh the news which is very often relaying WG propaganda shit says that Sabo killed a WG king, I won't forgive him if true", I'm not very pleased with Dragon's characterization.
And even then if it was actually true... Yeah he killed a WG king, so what ? Ain't you guys the Revolutionary Army ? Ain't it what you're doing to kill those rich World Government puppets ? Sabo could have had his reasons, but Dragon immediately said "I won't forgive him" without trying to understand, if it ended up being true (which, again, was always a ridiculous statement coming from him. Luffy would have never doubted his nakamas for instance).
(But yeah, Dragon doubting Sabo based on an obviously biased newspaper did him no favors)