Good day and welcome to my page. My name is Favour 
Despite the fact that action is necessary to bring about a change, it can be prevented in so many ways. Though it can be two sided: positive or negative. From this aspect i'll be talking on the context of what prevents an ethical action.
Bad mindset: the human life cycle is guided by ethics we must follow for a balanced ecosystem. When one develops an unfair mentality many things run through the mind such as corruption, bribery, embezzlement of public fund, sexual assortment, destruction of lives and properties and many more. Bad mindset is said to prevent good actions towards life and this can be as a result of the cycle of friends or peer group one has. It is often said that show me your friend and i will tell you who you are. Beside friends, bad character can also be induced by the cycle of family one finds his/herself especially when you find yourself within a bad family which can be yours or distant.
Bad mindset can be controlled and prevented by changing your cycle of bad friend and influences. You can as well prevent such by been committed to a religious organization that propagates ethical dids. There's is certainly no good life in become bad and wayward. Do do all it takes to prevent bad habits by meeting with good friends who can position your life in the right direction.
Habit: Desirable actions can also be prevented by unethical situations or habit. The effect of air pollution, sewage disposal, bush burning, indescriminate falling of trees or deforestation, noise pollution, ozone layer depletions and many more can all be prevented by take appropriate preventive measures to curtail their effects, but things that prevents undesirable actions ranges from the act of laziness and procrastinations. These causes defaults in taking appropriate steps or action that would better one's habit preventing nemesis in the future.
Inconsistency: When someone is not consistent it makes one get too weak in taking decisions. Lack of consistency is born out of procrastination which wastes time alot. When you're unable to take a decision and stand by such, it leads to lack of action at due or appropriate time. Inconsistency is a barrier to action as procrastination is too.
In which ever way, action is a necessary tool that gives resultants and must be taken when due. Never delay what you're meant to do as time waits for no man. Be active and creative in all you do and see yourself getting the appropriate results when expected.
@mhizfavour