Schumann’s piano pieces alone (to name but one work) prove that you do not need atonality to express the full range of human emotions. Any suggestion otherwise is sheer absurdity. Forms of tonality and tonal organization reign in virtually every form of music produced by every human culture prior to the cataclysm of artistic “modernism”. (Modes, raga, microtonality, etc.)
Atonality is, to me, a sign of petty angst, pretense, contempt for other human beings, and a general dearth of creativity or artistry. Good art, to me, communicates to its audience in a language they can understand; it is self-evident; I don’t believe it should require explanation or erudition to be understood and appreciated (though erudition can and should enhance the experience for those fortunate enough to have it.
Atonality is, to me, the Ivory Tower of music, a baleful snobbery that deems anyone who points out what is obvious to all—that it does not sound pleasant—as an inferior peasant. I see it as sound and fury signifying something only its composer is purview to—and hence, barely distinguishable from signifying nothing at all.
Speaking as a mathematician, it is also an technically insult to noise to compare it to atonality; statistically speaking, random sounds are more likely to have quasi-tonal, modal, or honestly tonal passages in them than, say, your average piece of serialism.
I see tonality is an abrogation of music’s inherent teleological capabilities as a narrative art (the narrative being the establishment of consonance, and the creation and resolution of dissonance); analogous to music to what, say, Finnegans Wake is to literature: interesting from a technical or theoretical perspective, and that’s about it.
I can’t stand atonality for the same reason I can’t stand alcohol: it burns going down, causing me physical (and psychological) discomfort in the process.
Listen to it if you must, but please... don’t say it is necessary.