Well, no. The dems lost for two reasons, both of which were pretty foolish, but their poor messaging on these fronts is pretty damable.
The first, and most important, is the economy. To the extent that anyone switched from voting D in 2020 to voting R in 2024, it was mostly because of that. I think that this was short sighted, given that even the most cursory research into Trump and Harris' respective stated economic policies would reveal that Trump is far worse, but given the choice between a status quo that wasn't working for most people and a radical change of course, it's no surprise that a lot of people chose the latter.
The second is Palestine. I don't think that too many people switched from Biden to Trump because of this (though there were undoubtedly some), Harris' support of Israel ABSOLUTELY served to suppress votes that otherwise would've gone to her. Again, I think that this was short sighted on the part of voters who stayed home because of this issue given that Trump is far worse, but the fact that Harris couldn't see this coming is pretty ridiculous.