Those who call on everyone to condemn white supremacists and not the ideology behind these attacks show everyone that they don't really care about white supremacy either. All they care is about what forwards their agenda. The same goes for those who condemn the ideology behind these attacks and not white supremacy. Stat far away from both of them.
Precisely, and as pointed out by Rabby Jacobson, it might start with the Jews, but it never ends there (and the same can be said with other forms of bigotry).
And make no mistake, while antisemitism and bigotry exist in all levels of society, I think it is mostly class envy (and/or incitement based on it) that turns those into actual violence or other repugnant actions.