I'm not a vegan but from my perspective if minimizing harm is your goal then veganism is the only valid choice.
Any meat consumption will unquestionably increase the misery and pain the consumed animals had. Both while alive and at their final end. You're lying to yourself if you cannot admit to that.
Your argument wrt the insects and land animals is super strange too... What do you think the animals are going to eat until they're butchered? Love and good feelings?