Polish peasants were killed in Wolyn by angry mobs who lived through a lot and just couldn't keep it anymore. Was it wrong? Of, course, but there was no UPA army in it, no matter how hard you will try to smear our soldiers.
Are you serious? It is well acknowledged by both foreign and Polish historians that OUN/UPA organized genocide/ethnic cleansing of Poles in Vohlynia and Eastern Galicia. IPN is conducting investigation about it, under Article 118 of Poland's Criminal Code, which pertains to genocide.
There is no doubt which organization bears the responsibility for massacres. I don't understand how can you blame angry mobs for them. Some time ago you spoke differently.
The following paragraph summarizes OUN/UPA attacks well:
The OUN-B planned and organized attacks thoroughly. Through rapid concentration and swift convergence upon a targeted locations, the nationalists almost always had the element of surprise and superiority in numbers. After a village was overrun, mass murder, pillage and burning houses followed in quick succession. All vestiges of Polish existence were eradicated and by torturing its victims and mutilating bodies, the OUN-B/UPA made deliberate efforts to generate mass flight of the Poles.
source: books.google.pl/books?id=2c6ifbjx2wMC&pg=PA31&dq=immigration+to+asylum&as_brr=3
Roman Shukhevych completed studies at Lviv Politechnic Institute.