If someone breaks into your house at night, and you kill him/her; you are not guilty of bloodshed. But, once the sun comes up (and, presumably, you can identify him/her) and you kill that person, then you are guilty of bloodshed.
Wow, the law God gave to His people can be tough!
Thieves can be sold as slaves to make restitution (if they're broke). Firestarters must make restitution (pay back) for the damage they cause. If a man seduces a virgin and sleeps with her, he must pay the "bride price" (or dowry) to the girl's father). Even if the father won't let her marry the guy, that dude must still pay the bride price. A sorceress is supposed to be killed; as is a person that has sex with an animal or a person who worships a false god.
"Do not mistreat an alien or oppress him, for you were aliens in Egypt."
This, like many of the other laws and guidelines, is very sensible. I like the fact that God reminds His people where they used to come from. Nothing seems much worse than someone who does something bad or is from a certain place which causes him/her to be treated bad and when they are forgiven or delivered they turn around and treat others the same way. There's something wicked and mean about that. When you go through a hard time, you should be able to empathize with another person going through the same thing; not try to make that person's life harder.