Because Scrum is not actually "agile". Scrum preceded the Agile Manifesto. Scrum's creators attended the Manifesto creation; but that is no reason to assume that Scrum would be true to what the 17 people who created the Manifesto agreed on.

The very first value of the Manifesto reads,

"Individuals and interactions over processes..."

Over processes.

And yet Scrum is first and foremost a pre-defined process.

I know that people who are loyal to Scrum, like a religion, will claim that those who don't like it "do not understand it", or "did not do it right", but whose fault is that? It's not like Scrum is so incredibly complicated.

Somehow people are expected to have this secret wisdom that only "true Scrumists" have - everyone else is just ill-informed - unenlightened.

Sorry, I don't buy it.

Here is an article chronicallying how Scrum latched onto the Agile movement and, in effect, stole the movement, corrupting it: https://cliffberg.medium.com/scrum-was-unethical-from-the-start-96eedd0679ca