IDF arrests Hebron terrorist mayor Tayseer Abu Sneineh over ongoing terror activity

Why do so called Palestinians have a known, convicted and wanted terrorist as a mayor of Hebron in the West Bank?

What happens when murders are released in a so called prisoner swap?

"... Abu Sneineh was one of four Palestinians behind the murder of six Israeli yeshiva students in 1980.

The students, including two American citizens and a Canadian national, were part of a group that had danced from the Cave of the Patriarchs to Beit Hadassah in Hebron when Abu Sneineh and his terror cell opened fire. The six students were killed, and 16 others were wounded.

The Palestinians were convicted of murder and sentenced to life in prison, but they were later released in various prisoner exchanges Israel carried out throughout the 1980s. Abu Sneineh was released in a prisoner swap in 1983. ..."

IDF arrests Hebron terrorist mayor Tayseer Abu Sneineh | The Jerusalem Post "IDF forces arrested Hebron Mayor Tayseer Abu Sneineh early Tuesday over ongoing terror activity, according to Israeli authorities. He was convicted of murdering six Israelis in 1980."

The mayor is on the right hand side. Look what portraits are behind him! "Mayor of Hebron Briefs Turkish Parliament's Delegation About Hebron's Situation " (Source)