Caves evolve, perhaps there was a landslide that covered old entrance, and that is the only reason why paintings survived. I do not believe paintings would survive in open easily accessible cave. Just the urine from bats...
As for spirituality, people 30k years ago very quite sophisticated. They had paintings, music, maps, religion, porn... But entire population of Europe was like 100k people. And there was no need to crawl into one way death trap, when they had 1000km^2 to explore!
As for spirituality, people 30k years ago very quite sophisticated. They had paintings, music, maps, religion, porn... But entire population of Europe was like 100k people. And there was no need to crawl into one way death trap, when they had 1000km^2 to explore!