No ethnic group "deserves" their 'own state' (in the sense that they form the vast majority of the population), but it seems to me that having such a state greatly increases the security of an ethnic group that possesses one. If the relevant ethnostates (or whatever we want to call them) had been in place prior to the Holocaust or the the IS targeting of the Yezidis, both events may have had their severity lessened considerably or might even have largely been avoided.
Borders are not, and certainly did not use to be, sacred, but they are easier to maintain and defend, and they in practice provide a metaphorical line in the sand: cross this line with your weapons and you risk full-scale war, both with the country in question and its protectors and allies.
This is also another reason why I find the current radical Western European immigration policies atrocious: if they go on for long enough, they risk to seriously undermine the security and sovereignty of resident ethnicities.
It is also important to note that, already, such (more or less) ethnicity-based policies of ethnic sovereignty exist, including in Europe: the Catalans have their own parliament within Spain, the Scottish have their own parliament within the UK,
the Sami have their own parliaments within Norway, Sweden and Finland, and so on. It seems to me that it's only once an ethnic group forms a clear majority within a state that concepts of ethnic sovereignty become really controversial.
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