About 15 years ago, I was casually chatting with a successful portfolio manager, who was one of my mentors at the time. He had, for over two decades, been with an international asset management firm, which had multi-billion dollar AUM and an investment style of extensive bottom-up fundamental research with a macro overlay.
During our conversation, I told him that I was using technical analysis to pick stocks. He laughed, and laughed, and laughed, and said (and I remember it like yesterday):
"We piss on the hands of technical analysts."
I was very angry, but I didn't say anything to him at the time. I just paused. I had invested years in learning and practicing technical analysis, and I thought I was doing okay. I thought that what he had said was an extremely arrogant thing to say, and I was done with the conversation.
Ever since, however, I have repeatedly noticed setups like the one you described above: an indisputably strong technical signal (in this case, the "downward MACD cross"), but the stock price just does not act as predicted ("refuse to go down"). This is what's called a bear trap, and I agree with your last sentence.
To this day, I wonder if stock prices are manipulated to show certain chart setups to sway retail investors. I don't know the answer, but I no longer think that this idea is as crazy as it sounded 15 years ago.