I'm a practitioner and married to an initiate. Alignment isn't the right word. They're each a nation of Lwa, and there are other nations as well (the Nago, the Gede...). There are some houses that only serve the Rada Lwa.Hm. I don't really have the complete knowledge to be able to argue this effectively, but my impression (which I'm fully prepared to admit is utterly incorrect) is that Rada and Petro are less descriptors of the lwa and more descriptors of rituals. Rada, for example, is essentially a festival season - not an alignment.
Like I said: fully prepared to be corrected.
I think some of the issue is some people talk about how a lwa has a Rada and Petro aspect... but they're actually different spirits.
And... deeply problematic is kinda epidemic in deadlands, which is sad because there is some very fun stuff there but it's got a LOT of cringe too.