The examples were there to make a point, not be taken literally, but I don't think that really needs explaining.
The point remains that what is driving much of the remainer sentiment here is fear of what a UK government without it's hands tied by European Law might do, which in turn is based on fear that the UK electorate will elect a government that is minded to do it (in that context, the death penalty is topical today).
In other words, a lack of trust in the British people to do the "right thing" in the ballot box and a wish to tie their hands to stop such reactionary tendencies.
In that context, the relentless negativity of the remain campaign - with almost no attempt to make a concrete positive case for EU membership - starts to make sense, as - at it's core - for many, remain was never really about the EU, other than using the EU as a vehicle to deliver policies that the UK electorate couldn't be persuaded to support in the ballot box; and glorifying the EU as an idol that represented those policies while sweeping its many shortcomings under the carpet.