Culturally, the issues OP describes are a big problem for soft-tech people (muggles). On the subreddits for this stuff, people are having a great time running MCP CLI programs on their machines. Much of OP security comments are obvious to developers,(although some subtleties are discussed in this thread), but these users don't have the perspective of how dangerous it is.
People are learning about Docker and thankfully Claude include its usage in their examples. But really most people are just downloading blobs and running them. People are vibe-coding MCP servers and running those blindly!
As MCP takes off, frameworks and tooling will grow to support Security, Observability, etc. It's like building web stuff in the mid-90s.
Unrelated to OP, but I gotta say, in building these it was so exciting to type something into Claude Desktop and then trigger a breakpoint in VSCode!