Former Bank of Japan Governor Masaaki Shirakawa stressed the need to take unconventional steps to help underpin the economy in October 2010 but cautioned that the decision to purchase exchange-traded funds would entail risks, meeting minutes showed Monday. The BOJ decided on its first-ever purchase of ETFs, which are riskier in terms of price volatility than assets the bank had previously bought, at a policy meeting on Oct. 5 of the year under what it called “comprehensive monetary easing.” “It means that we cannot make up for possible losses with (money in) our pocket, but would pass the burd…