ImTired Colonies going dark is intended to be the calling card that a Hegemony Fleet has arrived in system, not that the colony is dead, I avoid killing colonies offscreen unless showing the fight there would be pointless (IE: its a really poor colony with no defenses), I apologize if the idea didn't get across.
More indepth, the NH likes to employ powerful jammers in battles to make their enemy's life much harder, it's what makes the colony go dark. If you send a fleet when the colony goes dark, then you will encounter a NH fleet moving in to glass the planet, usually I let this period go on for a day then if theres no reaction, assume the colony was undefended and glassed, then I make my next move.
PS. Angering me is already difficult, angering me so much that i'd be willing to throw away my position as a moderator is probably impossible.