Wait wait wait....
I think I see what's going on now. This whole time I've been talking battlefield tactics and rules of engagement, and you've been talking politics and diplomacy, right?
(Dude, they are entirely separate things. Though politics does have its own form of tactics and strategy, that's not the same thing as battlefield tactics. That's like comparing Machiavelli's
The Prince to Sun Tzu's
The Art of War - they do belong on the same book shelf, but they cover entirely different topics.)
As such, I suspect that you may have been getting caught up in how Nobles in this setting are seemingly portrayed as being all-powerful. And as such, I take it that you're assuming that the Count doesn't have to answer to anyone, am I right?
Well, here's the thing.
HE'S A FUCKING COUNT.
HE
DOES HAVE TO ANSWER TO OTHER PEOPLE.
Refer to this article:
https://en.wikipedia.org/wiki/Imperial,_royal_and_noble_ranks
You see that? He's got at least two noble ranks above his head (three if this empire uses the Grand/Arch Duke title, which I'm betting it does because it's an "Empire" and not a "Kingdom" - YES THERE IS A DIFFERENCE), and that's not even getting into the Royalty. Though more often than not, the children of royalty are usually granted Ducal titles or, for the crown prince(ess) ("crown" here meaning they're next in line for the throne), then they could have the title of Grand/Arch Duke.
What does this mean?
No matter what, this Count cannot go firing on other Imperial ships unless he has reason to do so that is absolutely clear and utterly unmistakable. And while failing to render assistance to the Count
is a serious foul, it's not serious enough to warrant the Count's ships firing on other Imperial warships.
And before you say that these ships belong to the Uncle...
...At what point was it mentioned that in the previous incidents that those ships had been under the command of said Uncle?
That's where you have the Uncle's plausible deniability. These ships all belong to other noble lords. And through some means of subterfuge, bribery, or even blackmail, the Uncle has managed to get them roped into this.
And before you can say that the Count himself can play the same game with plausible deniability? He can't. And that is precisely because the Uncle
is not using his own ships, he's using the ships of other nobles.
To put this into perspective, to an outside observer it would be like as if two people were driving down the same road in separate cars, and then suddenly one got t-boned by someone else in an intersection. What would it look like to the outside observer if the guy who got hit suddenly got out of their car with a gun and started shooting up the other guy's car? Just because he was there and didn't do anything to stop the other car?
THAT'S THE TRAP.
That means that the Count just can't wave a magic wand and say, "Oh, it must have been some kind of tragic accident" or some other BS. Because then the other nobles will be taking it up the to the next higher noble, or even all the way up to the Throne itself, screaming bloody murder about how this guy just fucking shot up their fleet of ships.
No, he cannot just sweep this under the rug. He cannot just hide it. Because if he tried to, then that means that somebody (or several somebodies) will have just lost a whole bunch of men and ships, and that will demand answers to some very hard questions. And no, it doesn't matter if the Count is in the so-called "Right" just because his ship has been attacked by a single, unknown, unregistered, never-before-seen type and class of ship that is flying no colors, no flags, and no identification.
This is because the Count cannot say, "Well it's obvious this unknown ship is part of their group." Because then the other nobles will go, "Are you fucking braindead? We have no idea where the hell that ship even came from!" And yes, that argument will fly because, unless evidence of the bribery, blackmail, and/or subterfuge turns up, then the investigators would have nothing to trump their word. Just like what happened in the previous incident on the vacation world.
Now, are we clear as to why it is a very very VERY bad idea for the Count's ships to just go firing on other Imperial warships all willy nilly?