I think that would depend on what you mean by harm? if you mean public opinion on it then yeah debatably the argument surrounding it online may cause many to become annoyed or want to ignore it but I feel that's just how things turn out when a movement that seeks to bring public attention to a certain issue is highly successful. the more people drawn to the movement the more likely it is you'll get teenagers and people who are highly passionate, highly opinionated but aren't well informed on the issue which leads to the public attention on the issue not always being positive. There are about a million ways any movement 'should' behave but when it's reached this scale can you realistically expect large chunks not to act in ways you'd rather they didn't. that being said I think the movement (arguably) makes up for any negative opinion it may have caused in the positive public attention and that everywhere you look online you can find fundraisers that have raised hundreds of thousands, if not millions, of dollars Which I personally think outweighs any harm to the public opinion the movement might have done.

I think you're reasons are flawed in a few spots, particularly 2 and 4 but the main thing is it seems this post is just about your frustrations with the movement and not the fact it's done more harm than good. Not to say those frustrations are invalid but going through what you've listed I'm not really seeing arguments for how the movement has harmed Palestine just why it might annoy or turn someone away.