(I mentioned this in another comment)

Because the people voting it down are the elected MEPs, whilst the people putting it up to parliament are the European Commission. The EC are appointed, rather than elected. Which means the powers that be just appoint people who are going to push through laws like this, that they want. The MEPs can't put up bills to be voted on.

You're doing God's work mate.

It's really surprising to me that this issue keeps coming up time and time again, until I realised that it's non-voted in parties actually trying to pass this stuff!

I didn't realise that the EU parliament simply says yes or no to bills and doesn't actually propose new laws, whilst the EU Commission are appointed and decide on what bills to push through.