...Is a metaphysical one - not a matter of 'evidence'. And that insight (metaphysics not evidence) is the first step.
The situation is that Life is a mixed-picture: the decision is whether Life is validated by its best moments or times; or destroyed by its worst.
As I said, evidence does not help - the question is not quantitative. This is a matter of primary assumption.
And the question is not answerable in isolation - Life can only be validated if Life has 'meaning'; and the nature of validation depends on the nature of that meaning.
On the other hand, if you have already accepted that life has no meaning - is merely determined, or random - then you have already made your Big Decision. (Whether implicitly or explicitly) your basic assumptions ensure that for you Life is defined by its worst aspects - indeed the single, most extreme worst-of-Life is the truth-of-Life (both for individuals, and en masse).
Nothing can be done for you - because any possible Good will be negated by One Bad Thing - even when that Bad is merely the evanescence of Good.
On the other hand; if you understand, and live-by, the conviction that the best of Life is the truth of life (despite that this cannot be continuous) - then you have indomitable strength, assurance, and hope.