True it is a country's decision maker's responsibility to think in terms of 'what's in it for the country or people' but this shouldn't be seen as arm-twisting.
Since Singapore has no natural resources like Malaysia or Indonesia, it should know that such resources comes from its neighbours. Be sincere and not be 'kiasu'.
One Malaysian academician said Singaporean Chinese believe the 'causeway-chained Singapore' is good 'feng shui' for Malaysia. On the other hand, Singapore is seen as not sincere because of its 'what's in it for our country' concept.
Friendliness and Asean cooperation are secondary and Malaysian resources like water, sand, airspace, KTM land, CPF funds are used as bargaining tools. In this how to collaborate?