DDT would work im both cases

I feel like thats not even that many roaches for a real infestation

Also doesnt mention what kind

And there are proffesionals you can call probably once to deal with that problem.

If you find a human living in your attic unbeknownst to you well

Thats a lifetime of therapy or more to deal with after dealing with the immediate problem

Roaches every time

A person because you can reason with him. Maybe he’s cool when you get to know him. You can’t get to know 1000 roaches because there are so many of them and they have no brains