Suffering is subjective, no?
I have heard many accounts from people who have resided alongside DS practitioners or visited the monasteries, who have explained that although they are saddened by the ban, they are no less happy or devoted to their practice. In the form of the highest practitioner, it is said that they will embrace difficult situations as a blessing for it furthers and strengthens their practice even more. In fact, practitioners pray to be born into situations that are difficult because it will be through that suffering that they are able to inspire and help so many more people. This could be read as true in many cases - for it is by the unfortunate suffering of these people, that so, so, so many more people in the world are now hearing about DS and doing his practice. Those who are suffering for the sake of the practice to endure and grow create tremendous merit for themselves (knowingly or not) in their act of bringing DS and dharma to so many... so is it really suffering? In the long term and on a larger scale, probably not.
For most of us at this level, this may not be easy for us to understand. However, yes, as Kris has said, we all have various karmas that would ripen with or without the ban on DS. The people who are suffering as a result of the ban, would have had to suffer the ripening of that karma anyway in another time, or under a different context or situation.
In the context of DS however, their endurance of suffering and by not retaliating in any way, but continuing their practice for the sake upholding the practice for others in the future, the suffering can then result in the creation of merit - as explained above. The "negative karma" and "negative" circumstances in this case, could actually be a result of good karma because they are now in a situation where they are able to create, grow and sustain something that would reap immeasurable benefits for the world. (after all, a situation is deemed "good" or "bad" according to what results we create from it - if we are able to bring great results, benefit to others through our own suffering experiences, then that suffering is a result of good karma; on the contrary, if we have had an easy life and because of that, become more greedy, complacent, selfish, then the easy life is a result of bad karma, for it leads us into worse and worse states).