And how many times have politicians given us supposedly cast-iron assurances or promises that later proved to be completely worthless?
George Bush Snr in 1988 - "Watch my lips; no new taxes".
Barraxk Obama's pledge to shut Guantanamo Bay.
David Cameron/George Osborne in 2010 - We will eliminate the budget deficit by 2015. They still haven't succeeded. Now it's 2019 but that's looking less and less likely.
David Cameron - There will be no top down reorganisation of the NHS, in 2010. They then undertook the biggest top-down reorganisation of the NHS in its history.
David Cameron - We have no plans to increase VAT, before the 2010 election. They then increased it to 20%.
David Cameron - No cuts to tax credits, before the 2015 election. Then he cut them.
David Cameron - We will cap care costs in 2016, before the 2015 election. They then abandoned that promise.
Etc.
Etc.
And these are elected politicians so forgive me if I treat any promises of the un-elected EU Commissioner Cecilia Malmstrom with a large pinch of salt. This is the woman who openly said (about the TTIP negotiations) "I don't take my mandate from the European people".