The witches do not express a philosophy of any kind, especially in the parts written by William Shakespeare. Hecate, a character added by (probably) Thomas Middleton in a later revision of the play, does express some philosophical ideas, such as "you all know security is mortals' chiefest enemy", recommending paranoia as a way of life. From the First Witch's account of her dealings with the sailor's wife who refused to give her chestnuts, we can see that she feels entitled, as many people accustomed to receiving charity do, and also that she is vengeful, but this hardly adds up to a "philosophy"
The witches in Macbeth represent a nihilistic and chaotic philosophy on life. They believe in fate and the inevitability of destruction and chaos, often manipulating events to bring about their desired outcomes. Their view on life is bleak, emphasizing the darker aspects of human nature and the consequences of ambition and greed.
The witches predict that Macbeth will be king and how he will fall. These predictions cause Macbeth to dedicate his life to following the witches predictions, doing whatever it takes to make them come true, or to avoid them.
The witches in Macbeth refer to themselves as the "weird sisters."
MacBeth meets the three witches with lady MacBeth
Macbeth.
The witches only gave Macbeth prophecies. It was his decision to do so after Lady Macbeth persuaded him. Although the witches' intentions was probably to cause this murder, the witches did not make Macbeth muder Duncan.
Macbeth did not like what the witches had told him.
No, the witches are proclaiming and predicting that Macbeth will be king and they are praising Macbeth.
Macbeth does.
Lady Macbeth echoes the words of the witches when she says "All hail, Macbeth, that shalt be king hereafter!". This echoes the witches' prophecy that Macbeth will become king.
There's no right answer. You have to decide for yourself who was responsible, which is what is so great about literature. There's either Lady Macbeth, the witches, or Macbeth himself. I believe Lady Macbeth was first to blame for her manipulation on Macbeth, then Macbeth because he chose to do the things he did under Lady Macbeth's word. The witches meerly told him what was going to happen in Macbeth's life.
Banquo and Macbeth. And the other witches, of course.
I think that Macbeth was at first not as "worried" about the witches and their curses as then on in the play he finds out that every thing that the witches has been tellin him are true.