ok let's look who did what.
The deal was that every state would get a vote to join Pakistan or India right?
There was no 3rd option, no independence. right?
For the most part the states with the corresponding population went with that country.
Now lets look at the outliers. Many Muslim sultans chose to go with Pakistan instead of India even though their population was mostly Hindu. India forced these Sultans to go with India. We Muslims don't have a problem with this because their population was Hindu and it rightfully belonged to India.
Furthermore, we also agreed to divide 2 provinces because Muslims only had a slight majority. We could have fought to keep Punjab and Bengal in tact, but once again, we realized that a large Hindu/Sikh minority wanted to go with India, so we were happy to let them go.
But when it came to Kashmir, India showed no flexibility or regards to Muslims and forcibly annexed Kashmir.
Just by looking at these facts, it is clear that India is indeed an aggressive state. And it only wanted to expand it's borders at the cost of it's morality, neighbors and most importantly, the local people.