Absolute revisionism, please educate yourself.
Germany (then and now) has a coalition system, so you don't need to vote for the lesser evil of two, more than one party can become a coalition.
There's still tactical voting of course, but Hitler became chancellor because enough people voted for Hitler that a coalition with the Nazi party or new elections were the only choices.
Yes, they could have gone for the latter, yes, conservatives are always happier to jump in bed with Nazis rather than leftists, so people might have tactically voted for Hindenburg, but my point stands: Hitler could have been voted out.