Because people generally don't find their religious beliefs threatened by the Laws of Thermodynamics. Meanwhile, anything that points to a world older than 6,000 years gets argued about endlessly by people who refuse to accept any evidence or chain of reasoning that contradicts the Bible.
The Bible does NOT contradict a very very very OLD earth. Just as with evolution it is flesh that interrupts what the evidence actually means or what the Bible literally says.
IF evolutionists literally accepted what the Bible literally says they would be quoting the Bible to demonstrated credibility regarding a very very very OLD earth.
What the Bible literally says makes the claim of evolution either down through the eons of time or a quick time process null and void and without form or simply put 'confusion'.
Not argued, refuted. Refuted to ensure the record is set straight. Usually it is easily refuted because those justifications of a 6000 year old earth contain easily identified falsehoods or distortions.