Depends on context. Is a fire extinguisher evidence of planned arson? Depends, was it just sitting there on its own or was it found next to a pile of fire accelerant, a box of matches, the blueprints to the nearby currently burning building, and a piece of paper with "Arson Plan" written on the top and "don't forget fire extinguisher, just in case!" scrawled on the side? Obviously this is hyperbole, but I think my point is equally obvious.