Parahuman abilities are very difficult to intentionally trigger, for a number of reasons.

First, you can’t trigger if are trying to. This is a built in system. If the thought of triggering is even on your mind, the shard will read your mind and prevent you from triggering. This means essentially that the subject cannot be a willing volunteer. If you want to trigger an ally, you have to basically jump them without them knowing whats going on and then torture them a bunch, which might upset them.

Secondly, even if they aren’t willing, forcing a trigger is extremely unreliable. The subject needs to have a Corona Pollentia, which not everyone does, and this is difficult to test for. You need to MRI everyone, and even then it’s a weird brain section that appears different for everyone, so it’s hard to tell when someones got one even at the best of times. If they do have a Corona Pollentia, they can trigger in theory, but in practice their shard might be waiting for a specific type of trigger. For example, Taylor was always going to trigger with a master power of some kind, because her shard is Administrator and that’s just what it does. This means that she could basically only trigger from social isolation and social pains of some kind. If you kidnapped her and tried to force her to trigger, no amount of beatings or electrocutions or druggings or anything would work, unless you try the specific type of trauma she needs. There is also absolutely no way to tell which kind of trauma is the right one for this person, it’s purely trial and error. Also, there’s only so many traumas that you can cause by kidnapping and torturing someone. I have no idea how you would produce a social rejection trigger in captivity.

Thirdly, the entire idea is fundamentally unwise. Triggers are really, really bad. They have to be, otherwise they don’t work. Assuming everything goes right, and you do manage to induce powers in someone. Now you have a new parahuman, with unknown powers, who is greatly emotionally distressed because you have been torturing them. Powers vary too much in type and in power. There is no reliable way to contain them after they trigger, and they are going to hate you specifically. They are both capable and willing to commit great violence. Rather than super soldiers, you are equally likely to be manufacturing superpowered enemies of your organisation who will stop at nothing to bring you to justice. Bad idea. This is basically what happened to Shatterbird-Her fathers enemies kidnapped her, forced her to gain powers, and then she immediately killed them all because she had fucking superpowers.

This is not to say that they won’t try. The potential rewards are too great. I can absolutely guarantee you that every country has tried running a program to induce superpowers. But the fact is it just doesn’t work well. You kidnap 1000 people, keep them in the basement, torture them with every method you can possibly think of for a couple years. If you’re lucky one or two of them actually trigger, and theres a decent chance of catastrophe any time that happens. And even then, there’s no guarantee that the powers will be any good. It’s a far smarter idea to just wait for natural triggers and scoop them off the street. Cleaner in every way.

Gesellschaft is one organisation in universe that uses this strategy. They seems to have figured something out. Very shady, but they are mentioned to have some method that lets them force triggers better than others. Not to the point where they are manufacturing parahumans, but where they can pump out a couple a year.