At the end of the day, it's all about how you weigh the evidence. If those examples are sufficient to tip the scales for you, that's your choice. However, Apple's overall trustworthiness--particular when it comes to protecting people's sensitive data--remains high for in the market. Even the examples you posted aren't especially pertinent to that (except for iCloud Keychain, where the complaint isn't whether Apple is securely storing it, but the fact that it got transmitted to them in the first place, and there exists some unresolved ambiguity about whether it is appropriately deleted on demand).