Political scientist: Some analysts point to the government's acceptance of the recent protest rally as proof that the government supports freedom of popular expression.
Conclusion
The government does not support freedom of popular expression.
Evidence
Supporting freedom of popular expression means accepting the expression of ideas that the government opposes as well as those it supports.
The message of the protest rally was one that the government entirely supports.
Evaluate
To prove you support freedom of expression, you have to show that you can tolerate views you oppose.
The government tolerated the recent protest rally, but it wasn't a view they oppose. They support the view.
The conclusion would be correct to say, . It goes to far by saying, "the government doesn't support freedom of expression". (This is an Unproven vs. Proven False flaw, not that it really helps us here)
GIVEN THAT this rally doesn't show the government tolerating a view they oppose,
HOW CAN WE ARGUE THAT the government does support freedom of expression?
We'd probably need to say, .
Goal
The author is Assuming a Difference. They're assuming that if the rally hadn't been a message the government supported, then the government wouldn't have tolerated it.