The chairman of the Senate Judiciary Committee says it's time for Supreme Court justices to bring their conduct in line with the standards of other branches of government.
As does the federal judiciary. Alito was a federal judge and while serving as such he knew damn well that any gift over about $20 had to be both turned down, and also reported.
That's the rules that federal judges live under, the same rules that most of the executive branch lives under.
Senators and Representatives have looser rules, but they do have them... And Thomas and Alito have been instrumental in loosening those rules.
Ted Cruz and the conservatives on the court actually made outright bribery legal if the bribed jumps through the right hoops. See FCC v Ted Cruz for more info.
For everyone except supreme court justices and sitting senators, there are actual consequences for accepting gifts in excess of $20. And sitting senators used to have consequences as well. Until republicans decided that the rules didn't apply to them, so they got rid of the rules.
The aggravating thing is, without rules in place, you cannot punish someone for breaking the rules. Not unless you like mob justice, with is never actually just, and never stops until the bloodlust is fully slaked.