This shows a great deal of naiveté on your part. Where did you get the idea pervs can't afford a
Disney cruise or the cost of Shutters? See this other poster's remark below:
And as to your very last point while it can happen (people taking their own photos), you best believe that if I see someone taking pictures of my kids with their personal phone or camera, they will
not have access to said phone or camera for very long!
As to the extra photos that showed up on your WDW trip, I'll ask *when* did your engagement trip take place? Also, we are talking about two very different issues. It's one thing that stray random pictures of other people were accidentally dumped by mistake into your account, than for strangers having the option to pick and choose from photos of your family from easily accessible prints and/or Shutters kiosks. Don't you think?