Not voting for a candidate who is tacitly supporting a genocide on that basis is not "doing bad things" no matter how much bad faith spin you try to add. The candidate has to earn the vote and that applies to non-voters too. Some people care about certain issues enough to abstain from voting on that basis and others vote strategically because its not a team sport. You just want validation for your own voting decision by implying those abstaining from voting are directly or indirectly responsible for your candidate's opponent winning which they are not. If Harris wins or loses it will be based on her and her party's policy and campaign decisions.
Either it makes political sense for her to adopt her current position or it doesn't. You can't get voters on both sides of an issue but you can mark where you stand on it and have people vote accordingly.