You made an either-or proposition. Either you're secure or you're not. The responder nailed it correctly: the issue is not "secure/insecure". His example showed that it's a measure of utility. How much effort expended by Apple and its users is worth the probable reduction in botnets on that platform and their consequent damage? Because botnets are historically so rare on MacOS (9 or X) the utility equation has always been very much in the don't-worry-about-it category. Not so for (for example Windows).

Will this equation change significantly with the new botnet? I think it's unlikely, but I dunno. Regardless, all-or-nothing seems to be the wrong perspective from which to examine this problem.