Radhasoamis cannot be considered as Sikhs as they do not accept Sri Guru Granth Sahib Ji as their Guru. In their view, a physical Guru is needed for giving us Naam. They do not accept the Guru Panth and the Guru Granth. That is the reason that they are missing the essence of Gurprasad (Guru’s Kirpa).
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The first reason why people are following such Dehdhari (physical) gurus is because they set an easy path for their followers with no restrictions or Rehat (spiritual discipline), which is where they are wrong as the easy path will not help us attain liberation and be one with God which is our ultimate aim. The second reason is that people have lost faith in Khalsa. The Khalsa is not in Chardi-kala (high spirits) as before. Khalsa doesn't understand their responsibility to fight against Adharam (righteousness) nowadays.