In my opinion, I feel that it is those younger and the middle aged monks who impose the ban more zealously is because they are somewhat insecure about their own spiritual practice which is why they feel that somehow imposing the ban would be a fast track to their spiritual practice.
This is what I have the most problem with - that the ban is being upheld in the name of religious purity and out of what is a supposed devotion to the Dalai Lama... but how is discrimination, unkindness, ostracism and attacks (psychological, physical, ethical) in any way a reflection of good practice or a good Buddhist?
If we really were students of the Dalai Lama, respected him so much and wished to be a good reflection him as a teacher, then why would we act in such unsavoury ways? It is one thing to choose not to continue your own practice of Shugden, in following the Dalai Lama's instructions, but it is quite another to also denigrate others who choose to maintain their practice, uphold such a cruel ban and act in such unkindly ways.
This ban, above all, has called into question so many aspects of practice - what it really means to follow a teacher's instructions, what it means to really maintain your practice without it being at the expense of another person's practice and relationship with their teacher. I think it isn't just the ban on the deity that has been the problem but more so, the ensuing reactions of people upholding the ban and the way Buddhists are treating fellow practitioners.