Google needs to err on the side of caution with DMCA because it's the immediate response to the requests that provides the safe harbor to Google under the law.
You had Disney (et al) lobbying like crazy decades ago to get the most insane laws passed when it came to digital IP.
Now we live in a world where those lobbying efforts were successful, which of course sucks for everyone that didn't have millions of dollars to spend on lobbying their interests and far outnumber those that did.
Minority rule through corruption causing a pseudo-oligarchy is sucking more and more every day, and DMCA takedowns are simply a small part of that larger sucking.