Indeed, if an alliance expresses interest in you, then if it's genuine you should be able to go back at the end of the round, or change your mind even. If however you decide to leave mid-round, and perhaps even you are approached and encouraged to do so because you're wavering between your decisions - well, then in the end you deserve each other, but at the same time you're leaving people in the lurch. Someone reminded me a few days ago that back in the day PA had 25k players (don't know if they were the official figures, but for the sake of argument). Wouldn't it be
nice if hordes new players could, should anyone come up with an advertising campaign that worked, join the game and make decisions for themselves. Not join the game, find an alliance, and a while later - two days, two weeks, two months - be egged on to ship jump by the genial manners of other alliances' recruiters pm'ing them? That way we all finish first. Mind you, on that basis of trust I suppose the same goes for spying in other alliances, but that's a whole different topic
Disclaimer: Oh. To those of you saying 'live with it' - go back up to the top and read gzambo's disclaimer. It happens to all alliances; people ship jump and don't have loyalty to that first alliance.
And now that we are reassured that the member in question is happy in his new alliance, of course we won't try and bring him back into our fold. Genuinely glad you found a happy home