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Once it is discovered that you lied, people will trust you less in future arguments, making it a bad long-term strategy.
The definition of 'Okay' is very subjective and is not specific enough in this statement to be able to give it a definitive answer.
Only if you consider winning a discussion worth more than being right and or telling the truth.
If your goal is simply to convince someone then a lie may take you there.
However if your goal is to be right, then you may still very well be wrong. You just make the other belive you are right. For a while.
If an argument will help persuade others to do good deeds, the lie becomes irrelevant.
Not if it is simply to "win" an argument. If a lie is used to support an argument in an effort to protect from harm(physical, psychological, etc.), I can see how it would be beneficial. One should be open to their views/opinions changing in light of new information or misinformation toward "truth"
Yes it is.
Trust me, I'm a graduated philosopher!