The slippery slope can easily be unintentional, like the fear that giving something up will just naturally lead to other things being given up as a logical extension of the first thing. That is why slippery slopes are often described when making exemptions for certain rights. It is not that someone is intentionally going to expand the exemptions, but that exemptions tend to lead to more and more exemptions as a slippery slope.
This one is intentional. Some slippery slopes are intentional and some are accidental. Intent does not matter.
Someone can intentionally trick someone onto a slippery slope and grease it up to make the slide faster, like Republicans are doing right now with undermining abortion and LBGTQ+ rights while claiming it isn’t a slippery slope.
Where do you get the idea that a slippery slope must be unintentional?
Is someone slipping on a banana peel unintentional if someone drops the peel in front of them? Do you think you might be taking the word ‘slippery’ a little too literally?