NA. Any time of day really. DC have had the map on lockdown since day 1 of the new campaign and you cant do anything at any time of the day without a response. Judging by your comment, you must be a DC that likes to kill pvp for everyone.When things get flagged people often rush there because they dont know how many people are flagging it.So I dont see how thats a single alliance problem
Also you need to be more specific with your complaint. Are you on NA or EU? Which time of the day does this happen and whats the general population of the campaign during that time?