My casual friend has asked me a few times to be picked up, what do you think about me telling them no?
Are you sure that you don't want to pick them up? Why not?
I feel uneasy when strangers are in my house. It makes me uneasy for them to have no place to go.
You should be there for your friends. Maybe you can discuss boundaries with them before going to your house? This might make the situation more comfortable for everyone.
I know, I'm going to blast techno so they can't hear shit and drive them in the dark. That's what they get for asking me for help.
That sounds a bit extreme and kind of rude, and I don't really see how it solves your problem.  But at least you've agreed to drive them to where they need to go. You're expected by society to help out friends in their times of need.