To kill an ally in order to deceive your enemy into thinking you're on their side.
What if Kylo Ren snapekilled Han? What if he's actually trying to defeat Snoke?
Killing someone you love to prove your loyalty to someone your spying on
Kylo ren might have snapekilled han solo
To murder a very important good guy in order to gain the trust of your evil overlord, in order to bring about his death
Kyle ren, may be snapekilling Han Solo , his own father, to prover his loyalty to emperor snoke.
To kill someone to deceive your dark overlord into believing you are his ultimate agent.
While he looked loyal to his family, he actually just Snapekilled his friend so his father would trust him again. (to Snapekill)