When someone dies they can no longer defend themselves, which makes an attack on their reputation somewhat unfair and one-sided – hence the traditional exhortation not to “speak ill of the dead”.
But when a public figure has recently passed on and is being lauded by his or her associates and supporters – and, in the worst cases, being used to make a political or other point – why is it considered wrong for the other side to counter those claims? Why should a cause get a free kick just because a proponent has just died? Positive spin about a controversial figure doesn’t suddenly become true just because it’s what their family would like to hear.
Families of deceased people who bask in the warm glow of public support can’t cry foul at public opposition. Either your grief is private or it isn’t. How can you expect to have it both ways?