It's not that people don't care; I assure you they do.
It's that... it's ridiculously old news. Combine that with the fact that at that point in time, there really WASN'T anime as widespread, nevermind on TV... fans take what they get, especially back then.
Really, "Robotech" being three series slashed together the way it was... yes, it was a horrible thing. However, at the same time, it was well over a decade ago.
Fans are not only getting ridiculously cheap DVDs of the "Robotech" dub that they grew up on, but also full, (remastered?) original Japanese language, subbed, DVDs of the original "Macross" and the other associated series of "Robotech."
The reasons that fans get more upset about the way anime is treated these days (in terms of bad releases, say, Cardcrappers), is that with anime becoming so widespread and public, the anime CAN be accepted more in its original fashion by such an audience. When "Cardcaptor Sakura" was treated the way it was, fans were upset not only because of the poor job done on it, but because it didn't reflect the original work... in a time when the original work COULD be appreciated on TV.
The same could be said for the first two seasons of "DragonBall Z," when Saban was handling the distribution under FUNimation. The hack job was pretty darn bad. However, fans got over it. That was '95/'96... six / seven years ago. Now calls are being made within FUNimation to re-release these first two seasons (it's all but officially confirmed) as "director's cut"-type releases with a full original Japanese language track (maybe even a new dub).
More companies are doing what they can, these days, to correct things that were done wrong in the past. The past is the past... at least things are looking much more up than ever.