No more insecure than a soft top really but I do take your point. Mine is locked in my workshop when not in use and as its a play toy it doesn't get left outside the supermarket for hours on end. I have toyed with the idea of putting a hinged tailgate made of mesh (similar to that on an ifor Williams cover) that I can take on and off easily, or even fold up over onto the roof but in reality I'll just put a proper roof on come the winter