Why do retail investors get trapped in sectoral and thematic funds? - A perfect fit for your portfolio?

Many retail investors have been adding money to sectoral and thematic funds, going by past returns and new themes launched by fund houses, with little attention to where these funds fit within their portfolios. Huge inflows over the last couple of years have made this the largest category in the equity mutual fund space, and it is time investors understood the risks associated with these funds, as reported by ETBureau. A perfect fit for your portfolio?