Quote from Marco two chapters ago: "Word doesn't come out of Wano, so we didn't know how bad it was here"
And even if he did know - which we know he didn't - this was the guy that was supposed to raise hell when his friends/nakama are attacked. The guy that challenged the entire WG over Ace.
And this guy should've just said "Nah, those baddies in Wano are Kaido and Orochi, nothing we can do folks ..."?
It is bullshit writing either way.