butchersapron
Bring back hanging
But currently under FPTP votes are already funneling to those candidates (tactically) OR else part of an unnecessary split in the left votes that potentially benefits the right.
AV allows for a proper disaggregation of preferences allowing the real extent of left support to emerge without it harming the lesser evil candidate. This is a tactical advantage from where we are now (left barely on the map) - if the left is regularly getting 30%+ of the vote without winning seats at the very least there's going to be a hell of a lot of pressure for reform if not more than that. But we aren't at that stage.
Well other shit aspects of FPTP do you want to incorporate into AV (which still is FPTP anyway)? Saying that system you're attacking does something shit so the system you're proposing should do it too is not much of an argument.
Your adoption of lesser evilism (a lesser evilism that still bizarrely places ther lib-dems on 'our' side) is a total admittance that AV will produce results which favour the established parties. And i think you have it wrong on your last point - those established parties will get the first votes not the second.