There is a debate because there are times of day when the price action becomes just downright silly. When this happens, the day traders become bored and to prevent the consumption of too much vodka or weed, they look for the "TA Doesn't Work" debates to engage their brains (which are at risk of turning completely to mush from the intense focus of the first couple hours of trading).
They know that the fundamentalists, who are building up a position to support their opinion of what price should definitely be doing and are deeply underwater while all these idiots keep [buying, selling], are heavily inebriated and stoned most of the day so they can become closer to God while reciting the Trader's Prayer (Please God, let me get out of this trade break even and I promise never, never, ever to trade without a stop again. Amen.) are quite willing to debate any time of the day and night because they're grumpy and want to release a bit of steam, and so we drop in to contribute to these debates to keeps our minds sharp for the next big intraday move.