Most of the people marching, demonstrating and otherwise taking action are not demanding the removal of the state of Israel or expressing anti-semitism.
Honestly, I'm getting really tired of trying to explain that the majority of people involved want a peaceful resolution, an end to killing, a solution that stabilises the Middle East for all. We aren't Hamas supporters so please stop implying or stating that we are.
All protests, political movements etc get some bad actors, people looking to cause trouble, to use it as a vehicle for spreading their own hate. Just as with any other movement, it's wrong to assume that that minority speaks for the majority. It's also wrong to assume that all organisers don't try to take action to minimise the impact of these people. Where I am, we do. We alert the police, we challenge directly, we keep more vulnerable groups of demonstrators away from them. We try to plan routes and times to consider others as well as our own needs.
We are not supporting Hamas or anti-Semitism. If somebody believes there should be a peaceful solution rather than more unnecessary deaths, if someone believes more needs to be done to minimise civilian casualties and facilitate aid getting to starving children, if someone believes non-violent negotiation is more likely to lead to the safe return of hostages, then they are welcome at our marches. Basically, unless someone is in favour of continuing to destroy Gaza and kill its people, further destabilising the Middle East for everyone, then there would be a space at our marches and events for them.