As for "antis" deliberately trying to cause incidents . . . I do recall one of the animal rights groups had a campaign some years back with the theme of "save a life, shoot a sign." Their idea was that by shooting up road signs alongside highways during hunting season, hunters would be blamed for the bullet-riddled signs and people would call for a ban on hunting.
As for antis being behind the recent spate of shootings . . . I've no evidence of it, but the timing of these incidents does - or at least, should - raise eyebrows.