What you said is true SatansDemons.
If someone knows how to use black magick it doesn't mean they should know. Some people, in fact many people simply don't have the understanding to responsibly use this kind of magick.
People get ripped of in the supermarket and think "Ooh how dare this guy, I'll curse yu to death!"
Or someone speaks rudely to them and they immedietly wish death upon this offender.
It's perfectly fine to use black magick, but try to use common sense and atleast be a bit mature when working with this magick or planning to use it.
The consequences depend on your capabilities. If you direct the energy wrong then it can indeed affect people other than the targeted individual, which can lead to these people getting in bad accidents when you didn't intent for that to happen.
What you said about the only cause according to Satan is however not true. Let us not argue about this.
Everyone is free to live their lives as they wish and use their powers as they see fit, however one must be ready for the consequenses of their actions. That applies to everything.
When one eats too much and sits around doing nothing all day the consequence is that you will become obese and ill.
When you go around cursing every person around you because of some immature reasons or some kind of superiority complex then the consequences might be severe for a person. The thing is, a powerful person can do this without any consequence to themselves.
This action reaction karma story doesn't work in that way. One can be the most terrible person and never suffer any consequences for their actions unless a higher power like one of the Gods would put a stop to it, or an empowered human would put a stop to it.
The consequence of your actions is exactly what you are invoking when taking the action unless some other force interferes. Atleast, that's how I understand it so far.
Regarding people who have wronged you, but their actions against you aren't really severe and a death spell is uncalled for you could simply do a short working to return the offence and bring justice, or simply detach them from your aura. Or you can bind them so they can't cause you any troubles in the future.
When you mentally mature you get better insight into what is satanic justice and what forces are needed to deal with certain individuals or peoples.
Most people act the way they do because they are simply weak and broken people because of the enemy programs against us gentiles. If one actively stands against you or hinders you in this life, or if one has wronged you or a person you care about in some way that cannot be forgiven then by all means it is fine to use a death spell to take care of them and you won't get any consquences if you perform that magick.
The entire universe is vibration. Vibration flows in the direction that it is directed in. When you use magick you are sending vibrations out to do something for you. You are shaping the energy with your will and use the vibrations to make certain things manifest that you desire. How effective you are at changing and producing these vibrations depends on your own power, but every thought creates a vibration.
There is not some magical force that will produce a counter vibration if you unjustly curse someone in order to give you some consequence, unless another conscious being that is able to manipulate energy and direct it to manifest his desires decides to act against you.
Energy is simply energy. Consciousness is what allows us to manipulate this energy and control it. The more powerful you are spiritually the more control you have over this energy and thus the more you can shape reality to your desires.
In short: If you desire to kill someone with magick and you desire no cosequence in return for your actions then as long as you are strong enough spiritually you can make this happen exactly as you wish.