It’s a totally fair comparison. Saying ‘whales are unavoidably killed by commercial ships so it’s no problem to kill them for food’ is the same as saying ‘some animals are unavoidably killed for crop production so it’s no problem to kill them for food’.
Did you miss the word 'deliberately''?
'Unavoidable' killing is insects being chopped up by the plough or field mice being chopped up by the combine or rabbit kits being scooped up by the spud picker (and then put through the chipper - it happens. DH used to have to pick them out when he worked on a veg production line).
The deliberate killing of insects, birds and mammals is what I'm talking about.
If we are prepared to countenance the deliberate killing of animals for crop production, it's not a vast ethical step to be prepared to deliberately kill animals to eat.
I have made a different ethical call from you. I respect your right to make a different choice.
habitat loss due to climate change (polar bears) or loss of habitat (jaguars etc)
Climate change is driven by the burning of fossil fuels more than anything else. Habitat loss is driven by many, many things, mostly underpinned by a growing human population (we've just lost a great swathe of skylark habitat near me to a new housing estate, built to house the growing British population).
and just deciding that because you can’t achieve 100% cruelty free you’re entitled to just wreak whatever level of death and destruction you like.
Did I say that anywhere? I'm all in favour of only having meat which is extensively produced on grass, with any supplementary feed being from silage, food wastes etc not grains grown specifically for them (except in limited cases). I'm in favour of high-welfare systems and clean slaughter and sustainable fisheries.
I get fed up of the sweeping generalisations. Vegans and veggies don't like meat-eaters generalising about them all being clueless urban tree-huggers preaching cruelty-free from a position of ignorance, because it isn't true, and carnivores don't like being monstered as ignorant, unthinking, brutal bastards who are happy to wreak whatever level of death and destruction you like because, oddly, that isn't true either.