Couldn't it be just as likely or more likely that multiple positive and negative rationales were in play at the time?
- reduced dependency on the US
- chance to learn something for oneself
- give boost to the Indian aerospace fields
- home-grown navigational abilities for war but also for civilian use
- pride, wanting to be seen as a global tech leader
- any other number of things?
I think it is amazing that we now have not one (US) but five (US, EU, CN, IN, RU) navigational satellite systems, two of which (US, RU) are globally operational and two more will be (EU, CN) by 2020. What interesting times we live in.