I really think there are two different aspects to the classification of the threat. It’s actually pretty analogous to the Afghanistan War.
First, neither Al Quaeda nor Hamas represent an existential threat to their opponents. The US hasn’t really faced a believable existential threat since the collapse of the USSR, Israel hasn’t really faced one since the 80s. Countries in Eastern Europe face an existential threat from Russia. And so on. Killing 1200 (or 3000) people, no matter how brutally or unjustified or evil it seems, it does not threaten to destroy the state of Israel. It is, of course, now an existential threat to Netanyahu, which is one reason why it’s being pursued with such enthusiasm.
The second aspect builds from the first and questions whether the solution pursued by Israel (and the US) were both efficient (ie proportional to the threat so as not to divert attention and resources from other threats) and effective. They have to be expected to achieve specific and measurable goals and timelines.
The ability to pull off an Oct 7th might have been equally well but more efficiently and effectively with intelligence and commando units, and Israel would have been given free rein by most of the planet to do so.
Theoretical biologist here. I consider viruses to define the lower edge of what I’d consider “alive.” I similarly consider prions to be “not alive,” but to define a position towards the upper limit of complex, self-reproducing chemistry. There’s some research going on here to better understand how replication reactions (maybe encased in a lipid bubble to keep the reaction free from the environment) may lead to increasing complexity and proto-cells. That’s not what prions are, but the idea is that a property like replication is necessary but not sufficient and to build from what we know regarding the environment and possible chemicals.
I consider a virus to be alive because they rise to the level of complexity and adaptive dynamics I feel should be associated with living systems. I’ll paint with a broad brush here, but they have genes, a division between genotype and phenotype, the populations evolve as part of an ecosystem with all of the associated dynamics of adaptation and speciation, and they have relatively complex structures consisting of multiple distinct elements. “Alive,” to me, shouldn’t be approached as a binary concept - I’m not sure what it conceptually adds to the discussion. Instead, I think it should be approached as a gradient of properties any one of which may be more or less present. I feel the same about intelligence, theory of mind, and animal communication.
The thing to remember when thinking about questions like this is that when science (or history or literature…) is taught as a beginner’s subject (primary and secondary school), it’s often approached in a highly simplified manner - simplified to the point of inaccuracy sometimes. Many instructors will take the approach of having students memorize lists for regurgitation on exams - the seven properties of life, a gene is a length of dna that encodes for a protein, the definition of a species, and so on. I don’t really like that approach, and to be honest I was never any good at it myself.