Not everyone with a knife or multitool wants to fix things in a positive way.
Park operators are also worried that certain classes of 'tool' carrying patrons will feel the urge to unscrew things, loosen bolts, cut or saw through and otherwise vandalize or damage crucial straps and safety devices on rides creating the possibility of havoc, injury or death to others. Some people tend to think loosening something would be funny without truely thinking how it will affect others.
Park operators are also worried that certain classes of 'tool' carrying patrons will feel the urge to unscrew things, loosen bolts, cut or saw through and otherwise vandalize or damage crucial straps and safety devices on rides creating the possibility of havoc, injury or death to others. Some people tend to think loosening something would be funny without truely thinking how it will affect others.