Funny how Americans assume if you support Palestinian independence, you support Hamas. No, Hamas is a terrorist organization.
What Kneecap knows, as does every person born in Ireland, South Africa or the US South in the pre-civil rights era, is that if you systemically choose to elevate one race over another, and the military power enforces a status quo, some people will choose violence. It's a tragic but logical consequence of saying "You are [White South African/ White Southern American/Irish Protestant, Israeli], so you get jobs, houses, police protection, good schools, healthcare, public facilities, etc., but you [Black Southern American/Irish Catholic/Black South African/Palestinian] get none of the above because of your [color/race/religion], some people will choose to react to that with violence.
This doesn't mean you support the violence, it means you understand that if you change the treatment of the people, the reason for the violence stops.
Thankfully, in the US South, a pacifist was more prominent leader than the Panthers or Malcolm X, and thankfully in South Africa, Nelson Mandela was more prominent than Black leaders who advocated violence. But IF you take away the reason for the violence, most people will choose to follow the path of peace.