The Government is not a "side."

The Government takes one side, and has given that side an unfair advantage using public money.

The issue is to be decided by the electorate, just as in an election.
The government has a view on the outcome of elections too, but it would be wrong to use public money to push that view.

I think that it's legitimate for a government to try to persuade us that their policies are good.

Not with our money it's not!

Anyway, most of the government hold a different view to Cameron on this, so it is not even the government view!