Happy to help! Sorry to hear about the former bad experiences. I'd like to think that's as much an artifact of being on Reddit than it is of socialists, at least as much as I know both of those things pretty well. Most of my friends are socialists, and we're very nice people!

I recommend books more than internet forums. There is such a wealth of leftist literature written by such wide-ranging and imaginative people. I mentioned David Graeber's "Debt" in my comment, for example. Debt is a cinder block of a book, but if you want to start smaller, he wrote "Bullshit Jobs" and "The Utopia of Rules," both of which are delightful. I'm partial to the latter.

I agree with you about the absolute madness of that submarine company, and about how unsafe our current economic system is (see also: climate change). I'd argue that goes far beyond the concept of limited liability. We have organized our entire economy on the assumption that everything that is made must be made by a for-profit company, but we also all recognize that without some adversarial force, be it from competition or government regulators, for-profit companies will start racking up body counts. This is a crazy way to make a society function. Why would you pick as your starting place a dangerous and shitty world, and from there hope that competition and regulation can make it better? Why not just set out to make things good in the first place?

I've actually written about why digital technology is particularly affected by this, if you're curious.