Hardly. Ties occur a lot in mafia just because there's two bandwagons. Take a look at the last mafia game, when the mafia believes someone is found, they typically begin to point fingers at the found player, so they look like townies.
The idea is to keep recommendations simple and justifiable. I don't see how your method is either. The problem is to determine what is fair for everyone in the event of a tie. Killing one of the tied players and not the other is not fair, and even less fair when it is not by random chance. The point of the vote is to select who the townies believe is a mafia member. Your scenario nullifies half of the voters, but not the other half. If you're going to nullify votes, either nullify all or none.
The problem with killing extra players with ties is that it benefits the mafia. If a mafia member is voted out as part of the tie, he gets to choose a player and take that player down, just like the townie does. Unless the townies are well informed, the odds are, the townie will also choose a townie. When voting out the mafia and reaching a tie, the townies that are correct are placed in danger, just because they found the right player to vote out.
Not to mention, if we add in a standard way to avoid lynching, there are other benefits, such as situations where voting out a member at all may not be in the best interest of players (a situation with three townies and one mafia member, for example). I am particularly fond of Khush's idea. It's simple, to begin with, it provides incentive for the townies not to allow a tie, while it doesn't punish the tie too much. There's no punishment to the townies that find a mafia member when they play with uncooperative players, and if the tie does occur, the mafia benefits, but only in a marginal way.
I don't understand your logic, Vudu. Yes, I understand we can learn new things, and yes, I understand that the person with new information is going to try to rally people, but most of the time when this occurs, there's not a tie. Most of the time, there's ties when there's two sides with very little information, so the decision on who to vote out isn't unanimous. That doesn't typically make one bandwagon more right than the other.