First of all, the expression is "Turned in to the cops. "Tuned in" is a very specific expression that is used to describe an audience or a person who is paying very close attention.
All three sentences you provided make sense to me and I readily understand the intended meaning. However, I believe they are all ungrammatical due to the use of the past tense in the "if" clause. In English, past conditionals can really only be used to talk about hypothetical changes to situations that have happened. For example, consider the following
If I went to class yesterday, I would know what is on the test.
It is appropriate to use the past tense with the "if" clause because you are considering what would have happened if you changed the past.
Getting back to your example, your use of the word "ever" implies that the opportunity to "turn you in to the cops" did not happen. It is more appropriate to use the present tense in this situation.
The most proper rephrasing of your sentence is
If I ever turn you in to the cops, it'll be because you did something wrong, not because I hate you.
A few notes:
- There is no need to use the present perfect (have done).
- It is also acceptable (though I'm not certain it is 100% grammatical) to use "it would be because..." rather than "it will be because...". The difference in meaning is subtle but "would" makes the sentence sound more hypothetical. Using "will" in spoken English give the sentence a nuance that it might actually happen.
- The use of the word "and" is not necessary in sentences like this that show contrast (the first because clause is positive and the second is negative). I won't go as far as to say it is ungrammatical but it doesn't sound right to me.
Going back to your original question, if you consider the sentence without the word "ever", the past tense still makes sense. The following sentence implies that the opportunity to "turn you in to the cops" existed and the speaker chose not to.
If I turned you in to the cops, it would be because you did something, not because I hate you.