Yes, they should have foreseen it.

This has been the crux of secularists for some time: If you allow one, you MUST allow all! If you allow a Christian monument, then you MUST allow a Muslim, and Satanist, and Hindu, and Shinto monuments as well. According to the Constitution, it's all or nothing. Naturally, the privileged Christians don't like this.

When Louisiana passed a school voucher law, to allow the state to help fund religious schools, they had to use the term "Religious Schools" in order for the law to be legal. When Muslim schools began signing up for the program, though, the legislators went berserk! As one legislator put it (paraphrasing): I thought 'religious' meant Christian.

In a different case, a city(?) government meeting always began with a prayer, but, to meet Constitutional requirements, they would invite different people to preside. When a secular humanist began the meeting not with a prayer to God but with an appeal to reason the officials were so upset that they actually said TWO prayers the next time, to make up for the missing prayer!

Christian (especially) privilege in the US is slowly being pushed down, forcing the religious to accept equal treatment under the law. And they do not like it!