So you would consider Biden and all of his 47 years mooching off the taxpayer as ethical?
The folks who elected and reelected him to public office must have thought it was ethical or they would not have voted for him.
The electoral history of Joe Biden, the 46th and current president of the United States, began in 1970 when he was elected to New Castle County Council District 4 with more than 55% of the vote.
In 1972, Biden defeated Republican incumbent J. Caleb Boggs to become the junior U.S. senator from Delaware. He was the only Democrat willing to challenge Boggs, and with minimal campaign funds, he was given no chance of winning. Yet is won with over 50% of the vote.
In the 1978 United States Senate election in Delaware, he won with 58% of the vote.
In the 1984 United States Senate election in Delaware, he won with 60% of the vote.
In the 1990 United States Senate election in Delaware, he won with 63% of the vote.
In the 1996 United States Senate election in Delaware, he won with 60% of the vote.
In the 2002 United States Senate election in Delaware, he won with 58% of the vote.
In the 2008 United States Senate election in Delaware, he won with 65% of the vote.
He did not fare as well in the Presidential Primaries. But he made enough of a positive impression to be chosen Obama and the Democratic party's Vice President on the ticket in the general election 2008.
If folks believe their House Rep or Senator is not doing a good job, they have an opportunity to vote them out of office upon reelection. If they do a terrible job, they can be impeached.
Holding public office is not a "gift" which cannot be taken back. Many if not most private sector jobs come with more job security than do elected positions such as Senators and Representatives. As was evident during Trump's time in office, appointees have even less job security (actually no job security at all).
Dianne Feinstein, the senior United States senator from California has held her Senate seat since 1992.