I need to reread all of Lenin on the adventurism, but does he ever talk about being opportunistic about this stuff?

The general Marxist (there wasn’t a “Marxist-Leninism” when Lenin was alive) sentiment at the time was that acts of “terror” (what we’re calling adventurism) are fundamentally individualist acts, and aren’t really worth pursuing unless they are both extremely popular, and exist as adjuncts of a broader mass-movement.