Dissident republicans threaten to kill more police officers and disrupt the Queen's historic visit to Ireland?

Personally I think this speech is ridiculous for a number of reasons! If the Queen visit was not wanted in Ireland, I'm sure the Irish people would protest peacefully and gain the result they collectively wanted. Would like to know what others think of all this: Does it really bother anyone that the Queen is visiting? What ever do the international community think of us lot after hearing such absurd threats? (PS. All view points are welcome as long as they don't include violence!)