Aren't you arguing against yourself?

'The EU can't be forced to do anything we want it to do because all members have to agree and that is unlikely' - the gist of your argument.

IF that were the case then the opposite would also apply - no legislation by the EU could be imposed on its members unless we, the U.K., agreed.

That however, as we know to our cost, is NOT the case - there are only specific areas where member states have a veto - for instance on whether a new potential member may join the Union.  Something which is often ignored when the subject of Turkey joining the EU is discussed.  In the EU the UK could veto their membership - outside we would have no voice in the matter.

Your dismissal of the ECHR as a mouthpiece for the EU is specious - in any case you will find little support for our exit from its jurisdiction amongst those who are campaigning for our exit from the EU - our signature to the convention is a totally different subject.  When the ECHR places a block on our deportation processes, (whether justifiably or not), that has nothing to do with the EU.