I understand that we spill wine for the plagues. People died, they went through hardship, and it was not their fault. But.... immediately after spilling wine for the plagues, we say that R' ...
The custom among all Jews (as far as I know) is to spill a drip of wine for each of the plagues as they are mentioned in a list in the haggadah. This custom is not mentioned anywhere in the Talmud (as ...