The fact that they've turned pirate is a solid indicator that they're not Amaris zealots; their priority is carving out a comfortable lifestyle for themselves, and picking fights with nuclear powers is not a good way to do that. Yes, ComStar and the Great Houses would absolutely shit their pants at multiple WarShips showing up (after initial absolute disbelief that backwater Periphery pirates could possibly have them), but then they'd break out the canned sunshine in response, and it's very doubtful that these pirates have a yardship capable of major repairs to a capital unit -- so their drone ASFs are expendable and replaceable, their WarShips are not.
Also in the realm of logical interference: a highly divided pirate group with multiple WarShips is very, very likely to be a loosely organized fleet of mostly-independent individual leaders with their own single ships.
Unfortunately for them, we've already hit the level of having space superiority DropShips that can seriously harm a full-fledged WarShip, and we're continuing to escalate our capacity at an almost exponential rate. An immediate confrontation is *not* in our best interest, but even if they come calling again as soon as a few weeks, we can make them *bleed*.