The U.S. has shootings; the UK has knifings. The statistics on knifings in the UK are appalling.

From end of May 2020 to end of September 2021 (16 months), cars have been driven into groups of protesters 129 times.

Guns aren't the problem; knives aren't the problem. Some of the problems are

the breakdown of families,
alcohol and drug abuse,
propaganda of violence and distrust (particularly via Internet), society's desertion of the mentally ill and mentally handicapped.
the rebirth of ethnic hatreds