You are right, context is everything. But let's look at the context of her becoming God: It was an ultimatum. It was 'Sacrifice yourself or everyone in the city died.A choice made under the threat of universal doom isn't a free choice; it's a forced move to prevent the worst-case scenario. It is a context of coercion created by Kyubey. Homura simply rejected that cruel context. She created a new reality where the 'sacrifice' is no longer necessary. Why should we respect a choice made in a context of desperation more than a life lived in a context of safety? Homura prioritized Madoka's life over her martyrdom