Trump is correct: The system is rigged. RNC caught stealing delegate-votes to secure his nomination.
Why even bother with all this hubub of an RNC convention?
In 2012, Boehner wanted a rule-change that would make it easier for the establishment to keep upstart Tea Party-candidates in check. And at the RNC-convention they bribed a bus-driver to keep the most vocal opponents away from the convention. And then he blatantly manipulated the vote. On camera. ON CAMERA. And he got away with it.
In 2016, this Monday, several states demanded a vote on a rule-change that would have benefited the anti-Trump movement. The RNC simply declared that some states had withdrawn their support for the measure and they didn't meet the threshold. They didn't say who supported it and who had withdrawn. They simply declared that these states' demands are void and that's it.
http://www.dailykos.com/stories/2016/7/19/1549959/-It-s-official-Trump-s-brass-knuckles-brand-of-justice-comes-through-loud-and-clear-at-convention
And at Tuesday, the RNC gave all the votes of Washington DC and of Alaska to Trump, ignoring how the state-delegates actually voted.
DC has 19 votes, Trump would have gotten 0. Instead the RNC counted all 19 votes for Trump.
Alaska has 28 votes. 12 for Cruz, 11 for Trump, 5 for Rubio. Instead the RNC counted all 28 votes for Trump.
Why even bother with primaries and a convention?