Agreed. Candidly, I don't think Disney or any other place of public accommodation has the responsibility to guard valuables that guests leave unattended. Disney provides vast amounts of dedicated "parking" for strollers as a courtesy, but policing those areas for theft would require an unreasonable amount of manpower, and Disney has no legal obligation to safeguard guests against the consequences of leaving their personal possessions strewn around Disney property. If things got bad enough, I could see Disney offering a "stroller check" whereby guests can check a stroller, get a claim ticket, and come back for it later (at a price, of course), but I don't believe the issue of stroller theft will ever become that big. Most people are smart enough not to bring expensive strollers, loaded with irreplaceable things, and leave them sitting around.