Missile Defence Shield - Risk Aversion or Risk Escalation?

Both America and India have plans for a comprehensive missile defence system that would intercept any incoming nuclear tipped missiles. For India the system would intercept at both exo-atmospheric altitudes of 50-80 km; and at endoatmospheric altitudes of up to 30 km. Both countries have touted that a missile defence shield is to mitigate risks from any "rogue" country launching a nuclear tipped missile. For US the rogue coutries are - China, N. Korea and Russia. In case of India the enemies are China and Pakistan.

However both plans instead of achieving the objective of risk aversion, have escalated war rhetorics. When US signed the defence system treaty with Poland, Russia responded by moving its missiles to forward positions. See here

http://news.bbc.co.uk/2/hi/europe/7710362.stm

In Asia, India's relevation about it's missile shield made both Beijing and Islamabad uncomfortable.

http://www.atimes.com/atimes/China/KA16Ad01.html

A study on India's nuclear program and its impact in South Asia shows a similar result. India's nuclear doctrine explicity states that it developed a nuclear program to avoid any nuclear attack against it. However after the nuclear tests in 2002, it achieved the opposite, with a threat of a nuclear war in South Asia at its highest.

http://www.stimson.org/southasia/pdf/SABMDKrepon.pdf