BECAUSE THEY HAVE ALL TURNED INTO BUSINESS AND CORRUPTION.
Actually Krishna went to a Mandir disguised as a begger and they threw him out ...shows how the corrupt people have taken over the places of worship.
Srila Prabhupad who started the Hare Krishna movement and built powerful International Society Of Krishna Consciousness was killed by his own gurus whom he initiated as they put poison in his milk.
By bowing down to deity's in Mandirs and bowing down to Holy Scripture in Sikh Temples does not mean much if your intentions and motives are corrupt.
Corrupt And Greedy Committees need to be thrown out and replaced by the right people who bring in right vibes like Atlentian Healing Temples