Is the use of ISA and Sedition Act Legitimate?

" The legitimacy of law lies not in its contents but in its application. If a law is applicable to one person but not the other, then its legitimacy becomes questionable."

The recent arrest of Raja Petra under the sedition act had evoked mass disaffection among the public and raised questions on its legitimacy. I have no issue with the law as it was passed by the parliament which consists of representatives elected by the majority of the people. Therefore, it is assumed that the majority of the people wanted to have this law. And since it is a law by the will of the people, it have to be obeyed.

However, when members of the ruling party acted seditiously, the law was never applied on them. It raised the question of why are there those who are above the law. In the eye of the law, everyone should be equal. Without this principle of equality, the law lost its legitimacy and the public gain the right to disobey this law. The government no longer has the moral rights to enforce this law and any attempt to enforce it will be deemed hypocritical and shameful.