How utterly tragic, but also senseless. I am going to speculate, something we all do to some extent.
I suspect the pilot had every intention of arriving at his destination before dark. I assume they were in Kingston to visit friends or relatives, and, as happens to all of us, time slipped away. Gathering up seven people and their belongings, driving to the airport, and preparing for departure must have been time consuming.
The 150 mile distance between Kingston and the Toronto area was a short hop, and perhaps the pilot considered the flight an easy one. As late afternoon approached, he may have failed to consider the effects of darkness and weather appropriately. After all, Toronto was less than 90 minutes away.
The crash occurred in the metro Toronto area, just a few minutes of flying time from the Buttonville airport, a medium sized facility that caters to GA. Did the pilot allow his airspeed to decay while searching for the airport among the lights of the metro area?
I speculate and ask these questions because the known facts reveal poor decisions by the newly licensed and inexperienced pilot. There were seven people in a six seat aircraft, which immediately raises the suspicion it was overloaded beyond weight and balance limits. The crash occurred well after dark, and a POA member posted above that weather conditions in the area were marginal for VFR flight.
Pushing all that aside, I have empathy for the families and friends of those lost. The crash of any aircraft is a horrible experience for the survivors.