A truth is a truth. The basis used by HH Dalai Lama for the ban on Dorje Shugden is unfounded. At this juncture, it is not so much about providing logical evidence to prove that HH Dalai Lama is wrong.
Since its inception, the ban on Dorje Shugden had caused great suffering on Dorje Shugden practitioners. In addition to the lack of religious freedom, the ban has impinged on the basic human rights of Dorje Shugden practitioners. Many Tibetan Dorje Shugden practitioners in particular had been ostracized, persecuted, harmed, discriminated, shunned, excommunicated due to the ban.
Peaceful protest (as well as any other form of protest) is necessary to bring to the attention of the World or to create the awareness of the injustice done by HH Dalai Lama and Central Tibetan Administration (CTA).
As with any phenomenon, the ban is impermanent. We must persevere and do whatever it takes without harming others to lift the ban. There will come a time when the right causes and conditions converge for the ban to be lifted.