I apologise for not addressing the central issue, that of graffitti and the pigs head.
No, this is not acceptable.
There is, however, a long history in all kinds of situations where people who feel disenfranchised take the law into their own hands because they feel that the authorities are ignoring them.
This happened in 1967 in Northern Ireland and the troubles lasted for thirty years.
It happened in Toxteth, Liverpool, Brixton, and Bristol in the early 1980's when young mainly blacks, but others also, felt that their concerns were being ignored.
When a white community see perceived preferential treatment being given to minorities, then law breaking can be expected.
Local and national authorities need to be more sensitive to the needs, fears, and aspirations of all of our diverse cultures, not just the minorities.