Yes it is the lowest form of participation and that’s also why there’s no excuse not to cast your ballot. Unless the ballot literally gets stuffed, turn up, if you can’t bring yourself to vote for any of the parties with reasonable chances vote for a satirical or random micro party. The animal protection one seems to be popular in Germany, heck they might get a seat and cause something to happen from the opposition benches, I rather have an opposition full of vegans than full of Nazis. That failing, invalidate your ballot. Nothing too untoward, ballot counters aren’t your enemy.