Please remove the misconception that Sikhs are created to destroy any community... Please correct your knowledge. Guru Nanak Devji has two companions with him.. Bala ji and Mardana ji (One Hindu and other Muslim). Also, Guru Granth Sahib ji is having Banis (Shabads) of our Guru, Hindu Bhagats and Muslim Fakeers... So Sikhism is a universal religion.. When we bow to Guru Granth Sahib ji... we also bow to Guru Nanak Dev ji and at the same time we bow to Bhagat Kabir ji and Baba Farid ji..
For you information.. Golden Temple's first brick was laid down by Muslim Saint.. Bhai Mian Mir ji... We are not against any religion but we are always there to help the people in need...
Regarding the incident it is very unfortunate that it has happened....