Ego is the overwhelming attachment. Closely related, Materialism.
NKT represents immersive ego generation and materialistic reach. Simply observe its protest rallies, teachers, stores, web sites, blog posts and temples.
Ideas are attachments too.
NKT's ideas of politics and religion are strong attachments. Again, simply observe its protest rallies, teachers. stores, web sites, blog posts and temples.
The spirit of Buddhism is to propel beyond attachment by engaging compassion and wisdom to relieve suffering, ultimately to eliminate it.
There is really only one reason to care about NKT. The harm it is doing to its followers and the public by misleading them toward attachment and suffering.