A cloying martyr movie, Veronica Guerin is all the more shameful because it’s based on an actual person. In the 1990s, Dublin journalist Guerin published extensive exposes on the drug rings in the city, eventually paying with her life. Cate Blanchett has the right sort of fire to bring some dignity to the proceedings, but director Joel Schumacher can’t stop his movie from posing – after her murder, he frames her fallen body as if it were a religious icon