Why is Les not in favor of emotionalism in spiritual decisions?

Les explains this in connection with Esau, who lifted up his voice and wept and sought the blessing with tears, yet his weeping did not change his status in faith; he did not come out saying he would believe God or be a man of faith. Les teaches that people today can likewise go through an emotional upheaval, and that is why he is not very much in favor of emotionalism in these things: people can be forced by emotion to do things they do not really mean. He cites his favorite cliché, “Anyone convinced against their will is unconvinced still.” He also relates an example where someone brought people into their home to watch a tape, and immediately afterward someone tried to force them to get on their knees and ask the Lord to come in. Les says that does not work and is not the way God does things; God opens hearts, and it may take time.