Apostasy laws are unfair if true

You mean to tell me that killing somebody just because they don't believe in the same thing you do is fair?this is exactly what quraysh was doing so how are you doing something good while they are not,both of you are killing people who don't believe in your religion so what gives?also if you say that the ahadith regarding killing apostates are only applicable for those who fight against islam then tell me what is your source on this because I saw a video of sheikh uthman al khamis saying that the prophet and his companions did it and you can't be a Muslim if you don't believe that it's a right punishment,imagine the outrage that Muslims will feel if a country like Italy did the same thing,if they said"were going to kill everyone who preaches islam/joins it" I'm unsure what to believe