Why mosques in Bulgaria spring like mushrooms

Because the EU was deaf and dumb about any muslim invasion and genocide against the Bulgarian people. The same goes for the systematically corrupt Bulgarian government. The orthodox people should pray to survive in their own country while the brown monkeys play a Russian roulette without them being involved (for now). No racialism involved. On the contrary - these parasites brief thankfully and exclusively to this same EU - the "human" integrator where humans' toleration should extend to the grave. Well, no, thanks. And a special note to all EU media: stop calling the cancerous scion Bulgarians, these have nothing to do with the native population.