Really there is no humane way to kill an animal who doesn't want to die. They get beaten, shot , gassed , grinded up, fur ripped off, boiled, skinned alive throats slit etc. It's terrifying for them and horrible for most to watch.
Yes, there are many barbarically cruel methods that some people use to kill animals, but it's perfectly possible to stun them and then make a quick, near-instant kill. I know you'd probably still object to this (which is fine), but it's worlds apart from dropping a living animal into a pan of boiling oil.
I think vegans should educate , but at the end of the day it comes down to personal values, which I don't think should be enforced.
It's the use of the word 'educate', though, that annoys so many people. I'm always suspicious of any use of the word when applied to adults (outside of university/night school etc). Meat-eaters know very well that an animal was killed to produce their meat - what do they need to be educated on? The fact that some people see this as morally wrong?
It's a bit like the abortion debate - some people see it as the clear murder of a human life and can't understand why anybody wouldn't realise this; others see it as a cluster of random cells and/or a wholly-dependent/parasitic potential life and can't understand why anybody wouldn't realise that the life, health, wellbeing and bodily autonomy of an adult woman are much more important than any perceived rights of the contents of her uterus.
Pro-life protesters who put massive gruesome pictures and slogans relating to abortions on display in public are roundly condemned; yet when protesting vegans march with placards showing blown-up photos from abattoirs, they assume the moral high ground and will frequently not go quietly if the law steps in.
I totally agree with you on it coming down to personal values being respected, though, and that these shouldn't be enforced. Don't forget that, if a particular set of values were to be somehow enforced, who is to say that it would be those of vegans (the minority) that would be the democratically chosen ones? Nobody should be forced to eat meat but, equally, nobody should be banned from eating meat.