You can believe it and simultaneously function in society.
We aren't all building our own planes because it's worse, but because it's time consuming. I don't have 20,000 hours to burn learning about how planes work to make my own.
If we magically beamed the knowledge straight into people's heads and also had a matter fabricator, I'd imagine yes - everyone would build their own plane. And it might be safer, I don't know.
Point is, the ideas are not mutually exclusive. You can believe both and still resolve it internally and with the world
Not the original poster, but that was snark and not meant literally.
Also, building your own plane is absolutely worse, even if you do have expert-level knowledge. That's true for any complex design. Aircraft design, material sourcing, fabrication, assembly and quality control are all very different skill sets, but the real kicker is experience.
The reason why commercial aircraft are so safe is a lot of work goes into investigating and understanding the root causes of accidents, and even more work goes into implementing design fixes and crew training.