@GoshisDead,
If you are saying that when an argument stirs up enough emotion to make emotion more valid (i.e. well grounded, or just) than reason, then this is, at best, a specious assertion. An appeal to emotion is not well grounded, or just precisely because, as has been previously pointed out, it throws out reason, logic and facts in favor of emotion. An argument lacking reason, logic and facts is a poor argument.
If you are saying that when an argument stirs up enough emotion to make emotion more valid (i.e. producing the desired results; efficacious) than reason, then you are right. The appeal to emotion behind the mosque protesters has been efficacious in prompting a heavy majority of people to say that the building of the mosque is morally wrong. Rational arguments have not been nearly as efficacious.
If you are saying that when an argument stirs up enough emotion to make emotion more valid (i.e. containing premises from which the conclusion may logically be derived) than reason, then you are plainly wrong because, as has been previously stated an appeal to emotion necessarily eschews logic, and therefore cannot contain premises from which the conclusion may logically be derived.
If you are saying that when an argument stirs up enough emotion to make emotion more valid (i.e. correctly inferred or deduced from a premise) than reason, then you are wrong because an appeal to emotion cannot correctly infer or deduce from the premise that it is morally wrong to build the mosque because of peoples emotions. It necessarily lacks the criteria (i.e. reason, logic and facts) required to make inferences and deductions. It merely
opines that it is morally wrong because of people's emotions.
Or, are you using the word "valid" in some other sense that I haven't covered?