These laws are so built into the fabric of the startup
world that we normally just take them for granted.
You're trying to defend something without considering the opportunity cost of it. I can understand why - you don't know what the opportunity cost is. None of us do. But that doesn't make your defence valid.If the government gave people privilege for howling at the moon, there would be a startup scene around it. That's not a defence of the policy.
For example, no startup could hope to survive without
laws protecting trade secrets
That blanket statements is false. Even if it were true, there are mechanisms that predate conceptions of IP that can be used to defend trade secrets, particularly contract. Startups depend heavily on IP laws.
Only some do. And then there are a raft of startups that can't and don't exist as a result of IP laws.