BV doesn't solves everything, but if you have nothing like that it just end up with Age of Sigma season 2.
The game is far from perfect piece so 'don't be a jerk' idea is a viable opinion, though. No one would think that this is a hardcore competitive game, are you?
That said, if the opponent have that much aircrafts, then why not to have an opportunity to strike them before they actually bombing your ground forces? Although you can't intercept everything but you may got some of them before they are actually get to the battlefield. Boeing Jump Bomber has no weapon except for two bomb racks, so it is an easy prey against any aero unit with a weapon can aim an another aero unit.
Also, it is unlikely that the bomber spam is attacker, or you will have a lots of dropships already.
Well, CA is far cheaper than the battlemechs and you may buy more at ease. But in the longer play, the logistics matters. You will need a 400t of cargo space in order to ship it again, but in the meantime the opponent can order a squadron of Aerospace Fighters and more. Being CA without VSTOL capability means they needs a proper airport, so air-raid the enemy runway would make them frown either.
Remember, if someone goes so mean, you can do the same either. If you are tired to do that? Right, that's why our ancestors were signed Ares Conventions. There is a reason why 'don't be a jerk' is a viable thing on here. In miniature games world, even the hardcore competitive games have the idea of don't be a jerk, for you need your opponent to play the game. Personally, I'm the person that accepts even the most nasty tricks as long as it is legal in games, but not all of us are able to do that.