Just to clarify, it isn't my trade. Our league abuses the veto. I typically think that it if both parties are happy with the trade, it should go through. However, if someone decides to give up this year and start building for next year, another team will benefit from that. If the beneficiary happens to already have the strongest team in the league, they become unbeatable and it removes the competitive spirit of the league.
But is that a justifiable reason to veto? and how do you get the whole league to agree one way or the other without people carrying out the rest of the season performing spiteful vetoes due to the perceived wrong that was done to them?