Ttyjfyk

He used his disability in order to win our votes, which is an evil way to win the election.

This is a sentence which I submit for an English class assignment,

but my teacher crossed out in order, which leaves the sentence to be:

He used his disability to win our votes , which is an evil way to win the election.

I asked the teacher why in order is crossed out, since it tells the purpose in this sentence structure,

having in order should be right and does not affect the meaning of the sentence.

But my teacher told me it sounds odd and doesn't flow well in her opinion, and also has nothing to do with redundancy.

Must in order be omitted in this case and Why?

I wouldn't say it's incorrect. But it's rather verbose. It doesn't change the meaning. It doesn't add anything to it.

I think in order to would make more sense at the beginning of the sentence.

In order to win our votes, he used his disability.

He used his disability (in order) to win our votes , which is an evil way to win the election.

In many cases, it's optional, and a matter of style, though it is a useful test for determining whether an infinitival clause is a purpose adjunct.

In finite clause constructions, it is more or less obligatory in examples such as in Open the wine in order that it can breathe, where dropping "in order" results in an unacceptable sentence, though acceptability can be restored by replacing it with "so".

“In order to” works in some contexts like this but not others. I agree with your teacher. One does something in order to achieve an end, but here, “He used his disability” is not something he did whose purpose needs to be explained by following it with “in order to”. It’s kind of like “for the purpose of.” This sounds bad:

He used his disability for the purpose of winning our votes.

That doesn’t sound right, because he does not use his disability only for a certain purpose (like winning votes). He always has a disability.

If you replaced “used” with “exploited” I think “for the purpose of” or “in order to” would sound less strange. “Exploiting” is what he actually did. Or “played up” or “emphasized”.

Bit of a dissenting opinion: I prefer your original sentence, it's a perfectly natural use of "in order to", in my opinion. It stresses the "for the purpose of" focus of the sentance, as with the simple "to" some readers will think the stress is "votes" or "win" or some other aspect.

It's certainly correct and grammatical and well within what I might expect to read or hear in public discourse.

I don't think it must be omitted in this case, but I think your teacher's edit constitutes an improvement.

Not every correction from a teacher happens because something is "incorrect." Teachers should help students improve their writing, and this change is an improvement.

In an article entitled 47 words and phrases that slow your reader down, the author urges: Cut the fluff (shortening "in order to" to "to" is one of the recommendations).

In an article entitled 15 Clunky Phrases to Eliminate From Your Writing Today – How to Crack Down on Wordiness, the author writes:

In most cases, the phrase “in order to” works just as well without the “in order”, with the infinitive form of the verb on its own. For example, the phrase, “In order to assess the author’s intentions” would work just as well if it read, “To assess the author’s intentions”, and no unnecessary words will have been used.

And #168 on this list of Flabby Words and Phrases reads:

In order to – Redundant phrase. You don’t need in order. Example: In order to succeed, you must work hard. Better: To succeed, you must work hard.

You were correct when you said that the extra words don't affect the meaning of your sentence. When that's the case, though, the more concise wording is generally preferred. I think your teacher is giving sound advice.