The delete link in the sidepanel is not checked for the right permisson. It checks if permission is configure and not delete.
See
main/core/src/main/resources/hudson/model/View/sidepanel.jelly
*-----
53 <j:if test="${it.owner.canDelete(it)}">
54 <l:task icon="images/24x24/edit-delete.gif" href="delete" title="${%Delete View}" permission="${it.CONFIGURE}" />
55 </j:if>
*-----
Should be
*+++++
53 <j:if test="${it.owner.canDelete(it)}">
54 <l:task icon="images/24x24/edit-delete.gif" href="delete" title="${%Delete View}" permission="${it.DELETE}" />
55 </j:if>
*+++++