Dem soc =/= Soc dem

Democratic socialists are socialists, social democrats are not.

In a de facto two party system it certainly can feel like a spoiler vote, however a single issue party can be highly influential in getting larger parties to adopt better positions on those single issues in order to avoid having votes syphoned away. In a truely multiparty system, a single issue party can directly extract concessions if they end up as part of a coalition government or are in a king-maker situation following an election.

2. I did everything I could, I recycled and brought my own cup to the coffee shop

Everything I could, except vote for representatives who prioritize climate over line-go-up