Citizens can also decide to submit things to referendum, and that has absolute decision power. To do so you need to gather a set number of signatures depending on the level of the decision (communal, state-wide or federal). This is very often used by political parties as a "weapon" to counter their opponent's decisions - they organise signature gatherings, and if they reach their goal the people gets to have the final word on the topic at hand.
Of course, anyone can submit a referendum on anything, as long as you gather the required number of signatures. You don't need to be elected or in a party or anything like that.
The system does lead to some ridiculous things being put up for nation-wide discussion, but that is usually seen as the cost of living in a direct democracy. I can think it's stupid, but it's your right to bring it to my attention if you consider it important (a bit like freedom of speech and the old "I'll fight your your right to say it even though I disagree").
EDIT: doh' I did repeat the "referenda" mistake here :/ Edited out.
> what does it matter if someone breaks one election? You can just run the next one fine
This assumes it's easy to detect manipulation which I think is very unlikely.
Edit: according to Wikipedia, Switzerland has 13 national referendums (not "referenda" apparently) in 2016 so not as many as I thought. https://en.m.wikipedia.org/wiki/Swiss_referendums,_2016