Although the slaughter of a labouring ox was forbidden, it was considered excusable in the exceptional circumstances; none the less it was regarded as a murder.
Simultaneously Wladislaus contracted an offensive and defensive alliance with Venice against the Porte, a treaty directly contrary indeed to the pacta conventa he had sworn to observe, but excusable in the desperate circumstances.
Such rudimentary and imperfect sketches would be quite excusable in a first draft, but inexcusable and incredible after the Nicomachean Ethics had been written.
I don't know if it's excusable that a developer didn't know the capabilities of the Dreamcast, but maybe Crave Entertainment didn't, even though every other 3rd party developer did.
Such language was excusable in the men of the Renaissance, fighting the battle of classic form and beauty and of the manysidedness of life against the barbarous terminology and the monastic ideals of the schools, or in the protagonists of modern science.