Terming SIMI and Bajrang Dal as dangerous, National Security Advisor M K Narayanan has said they are not two sides of the same coin.The NSA said there was a need to effectively deal with organisations like SIMI and Bajrang Dal "because then there are many copycat organisations . several micro units of the same kind may come up."He claimed "SIMI and Bajrang Dal are not two sides of the same coin, but both of them are dangerous."The former IB chief said more number of Bajrang Dal activists should be arrested "based on the information we have you can ban it but you will then not be able to sustain it," he told NDTV.He said as was the case with SIMI, "the evidences collected on procedural matters that got up with Supreme Court . you may get a vicarious pleasure of banned or not banned. What you need is to prevent them from acting and I think that is what needs to be done," he said.Narayanan said he was a firm believer that militant outfits "under whatever dispensation they are, should be banned."He said though the actions of Bajrang Dal are militant, "the problem around Bajrang Dal is that it really does not exist as an organisation."Narayanan suggested building up evidence to control such organisations.