100% agree that knowing some fundamentals can't hurt, strong opinions weakly held is part of survival, and overconfidence is a mass murderer. as far as rationality, what does that even mean anyway when the markets are made by humans and humans are irrational? if anything it just means that whatever the crowd believes to be true must be rational, and the crowd is frequently wrong.
I don't really concern myself with the crowd, but I do pay attention when I notice chatter gets excessively bullish or bearish and will tend to think the market is prone to go in the other direction soon. For example, after this recent run higher there's likely a lot of late buyers coming into the markets and people are once again starting to think, "How high?", and rush in. Usually, this could mean we're closing in on a short term top. At least in this post QE market.
Now, back to technical trading.
Fundamentally, the markets will move because of an imbalance between supply and demand. This could happen for a myriad of reasons and quite possibly those reasons will never even be known - except maybe after the fact.
Maybe some dumb clown with too much money in his pockets decided to buy a ton of stocks on a given day or maybe some other clown decided 4200 yesterday was a great place to hedge or take profits on his stock portfolio. Maybe Powell and his goons are buying stocks. Maybe shorts are forced to cover.
I rarely bother to even read numbers from actual news reports as my opinion have zero value/influence on prices.
The technical trader will/should only concern himself with how the market moves technically and trade accordingly.
Simply put: Is it going higher or is it going lower? If higher, go long, if lower, go short.
So, breaking out higher this week on poor breadth and what seems like a world that's on fire may not make sense from a fundamental viewpoint, but technically it's all perfectly rational and logical as prices are moving based on supply and demand as they've always done. If a trader knew nothing about what's going on in the world at the moment he should have zero issues going long, but if he lets his fundamental view interfere it may be very hard to actually trade the long side as it may make zero sense.
At the least that's my take on it.
