I am in total agreement to the cause of F4J, in principle, infact having been both an 'absent father' and 'single parent' I have seen both sides of the coin.
However, I and (I imagine) everybody else will not support the vandalism of any of our Heritage sites.
If than can not think up anymore harmless pranks to gain publicity then they should cease to be.
F4J must distance themselves from this act immediately and those responsible be strung up by the smaller of their two crown jewels!!