In India most sex crimes go unreported; which follows a similar pattern seen in countries throughout the world, including here in the United States, many offenders go unpunished, and the justice system moves slowly. So, yes improved and tougher laws on these crimes are needed, however, these laws will more after an attack has occurred, and less to prevent the crimes from actually occurred.
The young woman's death and brutal rape did not just happen because of weak laws, the attack happened because deeply entrenched attitudes held about women, that makes men believe it is okay to rape and sexually assault women.
This young woman had her whole life ahead of her but had it ripped away by hateful men, who felt they had the right to attack and rape her. The people commit these heinous crimes deserved to be strictly punished, thus the need for tougher laws on these crimes. However, until these attitudes are changed, no amount of laws will prevent these crimes from happening.
Some rays of light are provided by the people who are protesting these attitudes, the organizations who work to change these mindsets, and by the men who stand alongside women, saying that this is wrong.