Forceful arguments for the moral worth of animals / to go vegan

[aba4w]

How to best drive the point home that animals have value?
I was thinking something like this:
"Imagine your grandma being reborn as a chicken in a factory farm"
I think I've also heard about something more "name the trait" related, where some family member of yours is somehow "modified" until they are indistinguishable from a pig. But that seem even more convoluted, so the other person can just dismiss the hypothetical and call you crazy.

[brimstoneSalad]

That's a strange way to put it. Also, I think you'll have issues with reincarnation arguments outside the cultures that believe that.

In my view, speaking constructively about morality (what makes things right and wrong in general terms) is more useful than specific arguments or personal analogies. However, it could vary for some audiences.

[aba4w]

By speaking about morality in general terms, do you mean talking about things like "suffering" or "rights of sentient beings", things like that?
I agree that's generally a good approach. But the person might just be indifferent to animals, or pretend to be indifferent, so by drawing such analogies you might further push them into a corner. I just want to come up with arguments that are as forceful as possible, such that the person on the other end sounds like a lunatic if they refuse the arguments and bite all the respective bullets.

yea the reincarnation argument could be countered that reincarnation is just bs. However I think you could counter that it's just a hypothetical, and then if they still refuse to accept that, they have to argue against the usefulness of hypotheticals in general, which might be harder.