I already replied to that counterpoint as the last sentence in my paragraph.
To I suppose cut to the chase a bit to where I'd assume this goes next, my proposed benefit for the belief system is more in the context of it being beneficial on the scale of a whole society and my own inability to sufficiently doublethink and advocate for a belief system I do not personally believe in, that might not apply to you, and if so you might not see any benefit personally from the belief system. So if we're just talking about you personally and only you, my arguments may not even slightly apply.
Edit in response to edit: I don't see how a belief in determinism logically flows to a simplistic worldview and failure to account for minutia by itself. That said, with non-determinism and the existence of free will and soul being the somewhat default assumption in society that people generally frame their beliefs on, that does tend to leave a belief in and advocacy for determinism to dumb internet pseudo intellectuals (like me!) who certainly do have those issues, so it's a understandable statement and fear. I don't really have a great argument against it other then saying I can't seriously see it being issue caused by a belief in determinism if determinism was actually a default societal belief. I do think that those would still be problems, just as they are currently problems, just not that they'd come from the philosophy specifically. I think the opposite couldn't be said about the belief in a soul, for example, which does seem to be causing many anti-social behaviors in society currently, although of course it's pretty much impossible for separate people who take anti-social actions because of a belief in a soul from people who take anti-social actions and then justify it with a belief in a soul.