If the legal system in Denmark is anything to go by, being an accessory to murder is just fine. Attackers are protected to the hilt; their victims are left unprotected and fined.
In February 2015, the terrorist Omar El-Hussein murdered Danish film director Finn Nørgaard in front of café Krudttønden in Copenhagen. Later that night, he killed a Jewish guard in front of the Copenhagen synagogue. Danish police shot and killed El-Hussein during the subsequent manhunt.
Four men assisted El-Hussein after he killed the film director: They helped him get rid of the murder weapon, gave him fresh clothes and bought him a new bag, which he used to store the gun used to kill the Jewish guard. They also met with him several times in different places around Copenhagen in the five hours leading up to the murder of the Jewish guard. One of those places was an internet café, where El-Hussein googled for information about the synagogue. The four men were charged with complicity in the terrorist act against the synagogue.