Nope, they only provide a peaceful way to replace the man in charge instead bloodbath.

In a direct democracy like Switzerland, yes. In a very indirect democracy like the United States there is basically nothing you can do if your representatives are not doing their job properly except wait for the next election and hope the candidates get better.

No, it's not.

Democratic elections rely on the demos being informed of the truth.

Recent election winners have used social media to present, more effectively than using just the press, a preferred narrative that has - IMO - conned the electorate and won narrow wins for parties/people based primarily on falsehoods.

You can't preserve democracy by relying solely on elections.

Those who seriously, and serially, abuse the system also attack the ability of people to post/make their vote. Again happening the ability of the demos to choose their candidates.

In some countries the system stands markedly against a fuller democracy - by use of things such as electoral colleges, or first-past-the-post voting systems.

TL;DR see para.3