Both enthusiasm and love - love in its various formats of adoration, fondness, loyalty, admiration, hero-worship, erotic, etc - are differently expressed by different personalities. For many, making a show of one's enthusiasm or love holds the key in its value, even
authenticity. This applies most for those who find loudness, not necessarily always in volume, to be a barometer of how genuine and munificent their enthusiasm for something, or love for someone, is. In many societies,
PDA - public display of affection - is par for the course, and there are no snags in even snogging in public. In others, to show how fabulous your object of veneration is, you go into hyperdrive to proclaim, chant, shout or sing hosannas as loudly as possible, no matter whether public or private peace is kept or not.
The louder, the more
OTT, the more one invests greatness into one's champion. In other words, irrespective of the actual virtues and talents of the mahaan, what marks this person's mahatta depends disproportionately on her or his fans' capacity - that of the lungs included - to be loudly swooning to their deva. Which means if
Beatles fans did not twist and shout and scream 'Ringo!
Ringo! Ringo!' in full
Beatlemaniacal rapture, perhaps the four would have been considered less fab than they are today.