BC, normally I have great respect for your insight, but I think you need to think that over. Your statement needs to be qualified. You ought to say
'having, but never used bi torrent is not harmful.' However, once it has been used, and if not used carefully, there is the slight risk risk of a malicious bit of data getting into the system.
qBittorrent, and most torrent clients in general, are no more harmful to have installed, or to use, than a browser.
It's when you misuse them that you cause problems. if Bittorrent clients present a "risk of infection" just being installed, then so do browsers. But nobody ever makes a fuss about that. In both cases the risk lies in downloading illegitimate or pirated files. Ironically, when it comes to that, downloading via browsers pretty much guarantee an infection, but infected torrents are actually more sparse than many would have you believe. (Except if you are dumb enough to torrent AV software, which is 99.9% of the time infected)
This brings up the possibility of a two-fold attack. I do not know what the right buzz-word is, but a bit of malware comes in and starts your torrent program in the background and the torrent then contains a payload much more malevolent. To my knowledge that has not been reported.
It's not been reported because it simply doesn't happen. Different torrent clients work differently so it's not likely to be able to launch the resulting content on it's own. Another issue with that theory being that Torrent clients typically require user input when opening a torrent or magnet link before proceeding, at which point it is on the user if they say "OK" to "super malicious unknown file with major infections.torrent", and then later when the malware asks them to launch the malicious files they downloaded for them. I'd say it's possible for such programs to simply roll in their own simple torrent client, similar to how malware now rolls in cryptocurrency miners, but that's a lot of work for something that can be downloaded much more easily via http, which is how most trojan downloaders do it. And even in the cases where it might use a torrent downloader for it's payload, that isn't any different than if it uses HTTP; it doesn't mean clients like qbittorrent are malicious or present a risk of infection anymore than a web browser does. You cannot really speak of "potentials" in a vacuum to come to a conclusion about specific software, particularly when using fabricated theoretical uses.
A quick search show that same think just having it on your PC is a potent ion problem.
Here is a key phrase that gets a lot of hits:
Will a torrent harm me?
And Plenty of People think the world is flat or that the governments are ruled by lizard people. If your point is that there are ignorant people out there trying to inform themselves, then I agree, but I'm not sure how it relates here.
There are probably a lot of people who ask "Can Carrots kill me" but it neither suggests a risk that carrots will rise up and overthrow humanity nor that carrots possess any significant danger to health when ingested. It suggests some people want to learn the answer.
(The answer, I expect, is that only if you eat enough that the Vitamin A becomes a toxic dose, which is probably hundreds of carrots)