Actually that's rather old news.
The russian rumour mill favours the pilot no de-icing to save cash. "De-icing an ATR 72-200 would cost about 30,000 roubles ($1,000)".
That sounds like rather an exaggeration especially in a region which has cash coming out of its ears.
Sure thing, 30 dead people & total a/c loss costs a lot more than 6, 5000 rouble notes.
What were these people thinking?
I guess, 2 pilots in their mid 20s, an aircraft with no technical inspection since 2010, has done this trip probably every day for months in worse conditions, routine (complacency) as usual takes over.
Evaluation of risk where are you?