Board Thread:Questions and Answers/@comment-86.184.104.191-20150411001041/@comment-3131736-20150411110646

Ocelot leaked the REX-data to make money. He wanted to be rich, but the Patriots refused to give him money out of the Philosopher's Legacy, so he was allowed to make money by selling the data.

The Patriots wanted Solidus dead because while being President,  he already plotted his rebellion against them.