Earlier quoted context omitted.
WhatsApp is secured by Signal encryption
WhatsApp is a closed-source client that you cannot trust to faithfully and correctly implement the protocol, or be free of backdoors that allow Meta to snoop on your conversations.
And I truly believe Meta has an incentive to do so. They had to reveal a conversation on Facebook Messenger on the topic of abortion after the police asked for it, which resulted in someone put in jail. Regardless of Meta's (or rather Zuck's) ever changing political position, they don't want to have liability over anything like this. They want to walk away and just say to the cops, look it's all encrypted, there's nothing we can share with you.
Better keep conspiracy theories to yourself. It's ok to question things, but better back that up with evidence.