No, that’s a different standard. The standard for Garland was the Senate acting in accord with its own rules and the Constitution, and the standard for Kavanaugh was the Democrats lying, engaging in character assassination, unfounded accusations, hysteria, and violations of confidentiality.
Only indirectly. If the public thinks Kavanaugh shouldn’t be on the Court, then they would vote in a Senate where a majority or super majority is going to impeach and remove him. If the public did think that, one would expect that the Dems would pick up seats in the Senate in the midterms.
If your suggestion is that Supreme Court Justices should be directly elected, then you need a rather large supermajority to amend the Constitution.
But until that happens, then We the People do have to accept. That’s how it works in a republic.
Regards,
Shodan