People who evade tax and do money laundering are usually politicians and businessmen with connection.
True, but they "manage" their tax burden legally by shifting money around. They are not affected

Money laundering is a sensitive topic, no country should refuse to sign the agreement if they do not want appear as a supporter for terrorists and drug dealers. But "to establish an
automatic exchange of information on bank accounts, tax returns, assets and income held over all jurisdictions" is a tough obligation.