Election Manipulation?

What with Taiwan's close election result after an attempted assassination on the President being disputed and much being made of the Socialist's surprise win in ]Spain's general election][3] just after the bombing in Madrid, are we seeing a terrible new method of electoral manipulation? Possibly, but it's a high risk strategy, nobody can ever be sure how an electorate will respond to such extreme actions. In the end resorting to violence undermines whatever political arguments the terrorists might want to make.