In the United States, as I have so often stated, we have The Constitution which protects all God-given rights/freedoms from government rule; both foreign and domestic. In that founding document it states in the First Amendment:
Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof; or abridging the freedom of speech, or of the press; or the right of the people peaceably to assemble, and to petition the Government for a redress of grievances.
Thus it makes no matter if the President, governor, mayor or any other government office or agency makes an edict denying or restricting the rights and freedoms stated therein. The government does not grant such freedoms. The people need not petition for petition to exercising any of those rights and freedoms. They are granted, according to the founders, by God Himself, and therefore as it states in the Second Amendment regarding the owning of firearms:
A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed.
Now, as is true for "Christian Liberty" it is thus true for secular guaranteed rights and freedoms... they are to be exercised with wisdom and prudence. One is free to exercise one's right but it may not be conducive to do so, e.g., for the benefit of others. In the current situation which has come upon the world by the perfect providence of God, the rights and freedoms of those who profess religion, Christian or otherwise, cannot be annulled nor diminished. However it may be
prudent to not exercise their right to assemble in order to not further spread COV19. This would be a personal decision of individuals. At the same time, the government; federal, state, nor local has any authority to deny that right.
Soooooooo, John MacArthur has the RIGHT to open his church because that freedom is guaranteed by the Constitution. But John MacArthur has no authority to demand that all other churches MUST follow suit. To exercise the freedom of religion and assembly or to not do so is a private, individual decision. One has the right and freedom to assemble or to not assemble. One's conscious must determine what one does.
There is no cause in this matter for any professing Christian to "throw someone under the bus".