There is a big question why some radicalised youth want to kill Indians.

According to Bernard Haykel, an expert on Islam,the Mumbai terrorist
attacks of November 26, 2008, will be the basis for similar strikes in the
future.
According to Al Qaeda,Muslims are obligated to defend Islam.To
defend Islam they attack whoever kills Muslims. They argue that they have
to keep the balance of terror.They think Indians are killing Muslims in
Kashmir.They think the entire world is against Islam and violence has to be
taken into private hands to defend Islam.
There is a small minority of people who have become radicalised.
It is not just about killing Indians.Their ideology says: Islam is under
attack; the enemies are non-Muslims, specially  what they call Crusaders
by which they mean Americans and British and by Zionists by which they
mean Jews; they also say India is a part of this alliance of Crusaders and
Zionists; they use Kashmir but they also use other incidents like the Gujarat
riots and so on to say that there is a Hindu-Christian-Jewish alliance against
Islam.
It is not possible to fight these radical youth and jihadis with
police, weapons, imprisonment and traditional tools of law and security
enforcement. The world has to use what is called soft power, not just hard
power. The soft power has to engage these youths.They themselves will
have to engage their radicals and clean the house within.Their arguments at one level are quite appealing, like their argument on anti-globalisation and
environment. Some of Al Qaeda’s arguments are legitimate. Al Qaeda tells
radical youth to kill Jews and Americans and Indians. There is no connection
between the argument for social and economic justice and this claim to
go and kill people is not at all acceptable.