The fact that institutions can be corrupt (or corrupted) doesn't invalidate the concept of an institution. Humans must coordinate their efforts to have widespread impact, and institutions are the de-facto way to coordinate effort: from marriage, the nuclear family, and extended families to local clubs, churches, companies, non-profits, and governments at various levels.
Ever since the counter-culture movement of the 1960s, it's been cool to "stick it to the man", which unfortunately translates to anti-institutionalism too often. Tearing things down never yields a positive result when no good institutions exist or are created to fill the vacuum.