As far as the claim that the novels are depicting the Federation as facing too many violent crises...
For the record, TNG and DSN very firmly established that between 2293 and 2369, the Federation:
- Was the victim of the Tomed Incident, in which thousands of lives were lost and in which the Romulans were involved (TNG: "The Neutral Zone," "The Defector," "The Pegasus")
- Was embroiled in a series of border wars with the Cardassian Union that lasted decades, ending only in 2367 (TNG: "The Wounded," "Journey's End," "Chains of Command," et al)
- Was embroiled in a war with the Tzenkethi Coalition (DSN: "The Adversary")
- Suffered an attack from the Tholian Assembly that destroyed a Federation Starbase in 2353 (TNG: "The Icarus Factor")
- Suffered a breakdown in relations with the Klingon Empire that would have resulted in a Federation-Klingon war were it not for the sacrifice of the Enterprise-C to protect Narendra III
- Was attacked on several occasions by the Ferengi Alliance, both before and after official first contact (TNG: "The Battle," et al)
- Found itself embroiled in a new cold war with the Romulans (TNG: "The Neutral Zone," "The Defector," "Face of the Enemy," et al)
- Was targeted for assimilation by the Borg Collective (TNG: "The Best of Both Worlds")
- Became involved in the Klingon Civil War (TNG: "Redemption")
Mind you, this is just what's established in the canon for the TNG era.