I would speculate that the problem with handclapping lies solely in the motivation of the individuals doing said clapping. The Psalmist exclaimed, "Clap your hands, all you nations; shout to God with cries of joy!" throughout his writings. When we begin to dissect and question the motivation of others in their expressions and response to worship, I am worried that the greater of Jesus' teachings is lost- let us love one another- even those who may not be as far along in their depth of understanding.