The best expression of this positive approach that I know is by Joanna Macy, a Buddhist social activist.

我知道提出积极对待的表现方式是乔安娜·梅西，她是一位佛教的社会积极分子。

article.yeeyan.org

"Hedge funds take an activist approach, poking management with sticks, " said Joseph W. Cornell of Spinoff Advisors of Chicago.

FORBES: Magazine Article

The European Commission's regulators have customarily taken a far more activist approach to competition policy than their American counterparts.

ECONOMIST: Oracle and Sun Microsystems

And so there was a danger for Barack Obama of looking unresponsive, of staying too much on the sidelines, at a time when the public was demanding a more activist approach.

NPR: Obama Proposes Economic Stimulus Package