Another person looking in from the outside...
Why the apathy? Because AIPA doesn’t have much of a bargaining position compared to times past. Individual pilot qualifications, experience and performance appear to bring more to the bargaining table than the AIPA group. So it seems that many pilots would rather trust their own individual negotiating abilities, or if that fails, their ability to take their qualifications elsewhere.
Not saying that is good or bad, just the nature of a growing trend these days. Excellent qualifications and performance appear to engender excellent bargaining positions.