For someone who is known all over the world as a leader who promotes peace, love, harmony and non-violence, I find it really strange that the Dalai Lama does not address the issues. Shouldn't he just stand up and say such actions are wrong? That would make the most sense for a religious leader, as they should care about the spiritual welfare of individuals. But that's just my opinion.
Perhaps as others have mentioned, the Dalai Lama does not say anything, because the issue is more political than spiritual. If that is the case, the responsibility to stop such reckless suicide would be on the leadership of the people. But, as we know, the Central Tibetan Administration are nothing but selfish individuals, who only want to line their own pockets rather than help their people. They have received so much money from all over the world and foreign governments who in the past have been sympathetic to their plight. But they don't seem to have done anything to help their own people.
In fact, they have done the opposite, especially in relation to Dorje Shugden practitioners. They spend other people's money to segregate an entire section of their people. All because they need to keep the Tibetans under their thumb. The get involved in other religious affairs too, like the recognition of the Karmapa, which they had no business in doing. In short, they manipulate their people so much to keep their control. And staying quiet about self-immolation is just another example. As the article mentions, they instead use self-immolations as a means to line their own pockets. When greed comes at the cost of someone else's life, you know for a fact that they are not a worthy leadership.