Sick and Twisted Individual(s): Harming children

In Illinois, Someone is placing box cutters or razors on Monkey bars, rock climbing walls, and fire poles in children playgrounds. Nearly a dozen blades were found glued to monkey bars, slides and other objects at Millennium Park in East Moline. There was a reported victim of this was a 2 year old, who suffered  a minor cut to his finger but it could have been worse!
The question is, what possessed this person to want to harm a child? If, in the event, they find the individual who did this should face serious charges. Tell me what you think!
For more info follow this Link--->  http://www.huffingtonpost.com/2014/03/26/razor-blades-glued-to-playground_n_5032674.html