"If you don't listen to me, you were ruined."

Question

If you don't listen to me, you were ruined.

Is the above-mentioned sentence correct? The speaker is sure that if the listener doesn't listen to him, the listener will be ruined. What perplexes me is the tense clash i.e. present in 1st clause and past in the 2nd; while the speaker is referring to FUTURE.

Que 2: Can we have PRESENT STATE, instead? As in:

If you don't listen to me, you are ruined.

Note that we're talking about certain future. We are SURE that not listening to us will cause the listener to be ruined.

Answer 1

You can read this in the sense of "if you don't listen to me, you must be a ruined person". The fact that you don't listen is proof that you were ruined or broken in the past.

If that's what the author intended, it has the same sense as your present-tense example (you are ruined) but instead of making an observation about the kind of person you are now, the emphasis is more on the past, the event when you were ruined. If the people have been talking about some past event or trauma, this could be a way of asserting "when that happened, you were ruined - this is the proof".