There are no ultimate morals or ethics in street photography:
Is your needs more important than the needs of others?
The tricky thing:
What is more important– the feeling of your subject, or your desire or need to make a street photograph?
For example, in candid street photography — if your subject doesn’t know they’re being photographed, is it ‘unethical’ to photograph them?
Let me posit the first point:
It isn’t a matter of ‘ethical’ or ‘unethical’ behavior in street photography — it is instead a matter of: “How much do you care to shoot the photograph?”
For example let us consider this fact:
Everyone who you photograph will eventually die, and so will you die.
Think about future humanity
For example, I am very grateful that Philip Jones Griffiths shot the photos he did in Vietnam (and beyond). To me the photos of Griffiths was FAR BEYOND his subjects or himself; it was a testament to humanity.