I think all who have seen the movie will think that it isn't Antoine's fault. We will blame his parents, his French teacher, and perhaps the bad influence from his friend René. If they could understand him better, he would have not fallen like that. His life is getting bitter and harder throughout the movie. A single happy time is when his parents take him out to the movie. As he is so happy, the next blow becomes intolerable, and the fall is very painful.
The b/w picture by cinematographer Henri Decaë is beautiful as usual. There is also a brief appearance from Jeanne Moreau and Jean-Claude Brialy - whose characters are looking for a lost dog - in the scene where Antoine himself wandering in the street, alone and lost.