In 2010 Bitcoin had a critical bug (integer overflow) which resulted in hundreds of millions of BTC being created. At the time the network was small enough that users accepted the patch for it which forked the chain.
In 2018 another inflation bug was found by a Bitcoin Cash developer who was kind enough to fix it instead of take advantage of it himself.
Bitcoin is just software. Lots of people involved in Bitcoin don't know anything about software and treat it like a religion. Bitcoin can barely do a few transactions per second even when it's main use case is leverage trading on exchanges. I'm sorry but that'll never be how you take over the world's payments.
Instead of innovating on the software, the Bitcoin cult just declares it "done". I like Bitcoin but the community has actively sabotaged the project. It looks like the one world currency will be Libra (or similar) instead. Maybe that's not such a bad thing.