Whether it is a religious or racial issue, the spread of hatred through speeches that incite people to action against another group of people is just not in the nature or character of Buddhism at all. Lord Buddha taught harmony. For the sake of harmony, he even allowed the issue of vegetarianism to take second place - he didn't buy into Devadatta's ploy of using Vegetarianism to divide the Sangha.
The argument of wanting to keep the 'spiritual purity' of Buddhism intact just doesn't hold water. Purity in name and being used as a means to a 'confounding' end will not work. The trouble is that this line of talk will garner the support of the belligerent and the not so clear-minded , who are spoiling for a fight.
The results of violence between the Buddhists and the Muslims in Myanmar speak for themselves - already some 250 Muslims have been killed. Homes and business premises of the Muslims have been razed to the ground.The Myanmar Government has even banned the issue of the Time magazine, containing this story as the cover story, so as to prevent a recurrence of earlier violence and unrests .
It is possible that the Muslim community has made inroads into the economy and robbed the Buddhists of their livelihood in some instances. However, in this case,it is for the local authorities to take fair and firm action to curb this trend. Such an issue will not be resolved with violence.