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Telling people how to run their lives, businesses, families or countries creates unnecessary friction. When trying to build relationships it helps to understand the other side's point of view rather than fight it.
Blaming the other side for what has happened shows a lack of maturity and experience. If a negotiation goes wrong it is your fault! You have failed to prepare - you have failed to listen - you have failed to pick up signals - you have failed!
Trying to "sell" your ideas, plans or proposals shows that you do not know what is wrong. Good proposals do not need selling, they stand on their own. Selling to, or trying to persuade, others that they should work with your proposal may cause the other side to get suspicious.
If a negotiation goes wrong it is your fault!