Masks are cheap and simple with no drawbacks. Ventilation is easy in many cases. Keeping one's distance costs nothing (which is not the be-all of social distancing, I agree). Vaccines are free.

These are all ethical, very effective and cost the individual almost nothing.

Enforcing social distancing is complex and incurs costs. For outdoor venues it seems to be less effective. What other methods are causing far more harm than good, far more harm than doing nothing?