I think in India there is no incentive to be a fast bowler, batsman get paid a lot more and thats what indians see cricket as, a means with which to escape whatever cycle of poverty they are in , Many indians have had to live viciously hard lives and this gives them probably one of the best work ethics to succeed in the world, but they dont work towards the correct stuff, they have a lack of opportunities and a lack of a structured coaching infrastructure, the conditions dont help either, favouring spin and swing and going against express pace. and bearing with a comment made in the op actually indian bowling actions leak a lot of pace and are more geared towards acccuracy and swing than pace. Indians I think are also genetically weaker as it is a trend I have seen among their athletes, and between indians and people of caucasian and negro backgrounds who do similiar exercise
Pakistan develop so many fast bowlers due to the legacy of the likes of shoaib akhtar , tendulkar serves this purpose for india
One thing I work for is to disprove the myth that Indians cant be fast bowlers, I want to smash that myth up , I'm going to be the first indian over 100 mph.