When we want something badly, or are in real need, we know that we are vulnerable to temptation. Add to this that we have our personal flaws, such as greed. Greed means here not only greed for money, but also greed for power, fame or for sex. When we are in trouble, and when we are greedy, we wish something very strongly.
So if we see things from the side of the tempter, those occasions are the most opportune times to tempt someone, seduce someone from the way of God. I have no way to measure the temptation in the world, but when I look around me, I think I may say that 80% of temptation to human persons are related either to our problems or our greed.