One can choose to practice or not as we cannot be forced to do something we can't truly apprehend. In the end, Buddha taught us ways to be happy and the benefits of it which is something we can bring to in all lives. If we practice according to what have been taught, there will be no wrong unless our we practice the opposite of what Buddha taught and start using it for the wrong reasons. Practicing Dharma the correct way will help us eliminate the doubts and wrong view hence also leading to happiness. Yes, Dharma is to help people and ourselves, it is not for looking good or attacking people or else why practice?
I found a teaching by His Holiness Song Rinpoche :
The purpose of Dharma is to subdue your mind, to correct the actions of your daily life so that they become beneficial. So, Dharma teachings are a mirror that clearly reflects the actions of your body, speech and mind so that you can judge whether they are beneficial—the cause of happiness—or harmful—the cause of suffering.
Since beginningless previous lives, we have been under the control of disturbing negative thoughts, which have forced us to constantly create, without choice, harmful actions, negative karma, the cause of suffering. As a result, since beginningless time, we have been experiencing the various sufferings of samsara and, even in this life, we continue to do so. From the time of our birth, we’ve not had one day free of problems.
In other words, we’re sick; we’re patients. We’re suffering from the disease of the disturbing negative thoughts, which cause us to create mistaken actions, which bring the result of suffering. What can cure this illness? What can alleviate our suffering? What treatment do we need? It’s Dharma. Dharma is the only medicine that can help.
Now, the thing about medicine is that it has to be taken. The patient who has the right medicine but doesn’t take it doesn’t get cured. Similarly, if we don’t practice the Dharma teachings we receive, we can’t put an end to the problems of our daily life or escape from suffering.
That which we call Dharma is medicine to treat the mind, to change it from its unsubdued, pre-Dharma state to a better one. From beginningless time our mind has been stained, foggy, polluted and disturbed by the three poisons of ignorance, attachment and anger because we have either not understood or practiced the teachings. Dharma is medicine to change that kind of mind for the better.