The perception of viability of the "Thanos solution" (snap your fingers and a literal random half of every population ceases to exist) depends almost entirely on which side of the snap you find yourself on. Those for are banking on their survival. They don't care about yours.
There are, of course, a few who do want to be eliminated by the snap. They don't want to be in the resulting world, and death by snap is completely painless by any account. You simply cease to be. The only issue is you see it coming, so you have a moment to reflect. But nobody seemed to suffer for it. Just the ones who were left mourned the lost.
There's also the proposition made by The Leftovers (a TV show on HBO), that if you remove just 3% of the population, the world changes drastically. However, in that scenario, it was only on Earth, and it was only humans and, IIRC... birds? Every other population was not culled at all.