I feel that, but to be fair she's not in a position to do much more than promise at the moment.
I think it's an encouraging sign that she's not trying to duck the issue, the way she could. That's not a guaruntee she'll take real action, but if she's distancing herself from Biden on this even before she gets the nomination it's a good sign.
I think it's easy to forget just how extreme Biden is on this issue. Harris is your average democrat, but she's still not ideological like Biden is, most aren't. Biden went so far as to go around Obama to make promises to Israel when he was VP, I don't see Harris having that kind of unquestioning desperation to help the right-wing Israeli government.
I'd guess they are fully conscious of what they are doing and will happily push America over a cliff for their own sick satification. Ignore them, they are no better then the christo-fascists.
On the contrary, do not ignore them. People base their feeling on the group opinion almost entirely on how often they hear a particular argument. They won't remember that 90% came from 1 person.
Secondly, unless an idea is actively disagreed with, people (subconsciously) assume you agree with it.
Take every opportunity to disagree with the idiots. You won't convert them, but you will sow seeds in the minds of those they might be swaying.
It's a fine line. You don't want to feed the troll and get yourself frustrated. It may be helpful to rebutt the poster but you should only do it if you can be perfectly infomative and concise. The more you argue with the poster the more onlookers might think both have valid arguments. Most people who are as divisive as seen in the OP have no problem arguing in bad faith. They will move goal post so frequently if you try to defend on all fronts you'll look like you're being tossed around.
Point being, general advise, ignore them. More specifically, it's OK to rebutt them but don't expect any reflection on their part.