Well..... because...
" “These things I command YOU, that YOU love one another. 18 If the world hates YOU, YOU know that it has hated me before it hated YOU. 19 If YOU were part of the world, the world would be fond of what is its own. Now because YOU are no part of the world, but I have chosen YOU out of the world, on this account the world hates YOU. 20 Bear in mind the word I said to YOU, A slave is not greater than his master. If they have persecuted me, they will persecute YOU also; if they have observed my word, they will observe YOURS also. 21 But they will do all these things against YOU on account of my name, because they do not know him that sent me. 22 If I had not come and spoken to them, they would have no sin; but now they have no excuse for their sin. 23 He that hates me hates also my Father. 24 If I had not done among them the works that no one else did, they would have no sin; but now they have both seen and hated me as well as my Father. 25 But it is that the word written in their Law may be fulfilled, ‘They hated me without cause.’ 26 When the helper arrives that I will send YOU from the Father, the spirit of the truth, which proceeds from the Father, that one will bear witness about me; 27 and YOU, in turn, are to bear witness, because YOU have been with me from when I began." Jo15:17
....................?