They eliminate the evidence. In the case of my father's murder, they washed away traces of blood and burned their clothing and anything that might constitute evidence. The other crimes they had previously committed, the 50 break and enter offences and 10 car thefts, were premeditated. However, there wasn't enough evidence to prosecute them, even though authorities knew they had committed those crimes. Furthermore, in the case of the car thefts, they had already found customers before they stole the cars.
That shows that young people today are very well organized. They think; they know the consequences of their actions. If they steal a car, they know where to take it, the Montreal address where they have to go. They know in advance how much they will get for the car.
I don't find them pitiable at all.