Britain has no need of laws against flag burning

Johnson (1989), the Court struck down the law because "its asserted interest is related to the suppression of free expression and concerned with the content of such expression."
While it's not illegal to burn the U.S flag, people who do so in America must also anticipate consequences and criticisms from the public.

Should it be a crime to burn the American flag

Any law against flag burning, of any nation, is violating a person's first amendment rights.

a crime to burn the American flag

1989: Texas v. Johnson (491 U.S. 397) — The Supreme Court upheld the Texas Court of Criminal appeals finding that Texas law — making it a crime to "desecrate" or otherwise "mistreat" the flag in a way the "actor knows will seriously offend one or more persons" — was unconstitutional as applied. This was the first time the Supreme Court had directly considered the applicability of the First Amendment to flag burning.

amendment against flag-burning ..

1974: Spence v. Washington (418 U.S. 405) — The Supreme Court held that the State of Washington could not convict a person for attaching removable tape in the form of a peace sign to a flag. The defendant had attached the tape to his flag and draped it outside of his window in protest of the U.S. invasion of Cambodia and the Kent State killings. The Court again found under the First Amendment there was not a sufficient governmental interest to justify regulating this form of symbolic speech. Although not a flag burning case, this represented the first time the Court had clearly stated that protest involving the physical use of the flag should be seen as a form of protected expression under the First Amendment.

Flag of the United States - Wikipedia

—Vietnam veteran Richard Savage
Interest Groups/Opposing sides
Interest Groups
Citizens' Flag Alliance
Citizens Flag Alliance
The Citizens Flag Alliance is a broad

Opposing Sides
American Civil Liberties Union (ACLU)
Opposing Side 1
Making it a crime to burn a flag is against free of speech.

might be constitutionally applied against flag burners.

1968: Adoption of Federal Flag Desecration Law (18 U.S.C. 700 et seq.) — Congress approved the first federal flag desecration law in the wake of a highly publicized Central Park flag burning incident in protest of the Vietnam War. The federal law made it illegal to "knowingly" cast "contempt" upon "any flag of the United States by publicly mutilating, defacing, defiling, burning or trampling upon it." The law defined flag in an expansive manner similar to most States.

BRENNAN, J., Opinion of the Court

Urbana, IL — On the 4th of July, countless Facebook users donned their digital pitchforks and torches and praised the arrest and felony charge against 22-year-old Bryton Mellott. His crime? Posting a picture of himself with a burning american flag.

Constitutional Amendendment Issue - U.S. Flag

Capitol, finding thatthe act was an attempt to suppress unpopular speech. The Court'sdecisions in the flag burning cases has led to numerous attempts topassa constitutional amendment authorizing punishment of flag burning andmutilation,but so far the proposed amendment has fallen short of the two-thirdssupportnecessary in the Senate.