If you read everyones post one thing is clear, no one gets that bombing the strats helps the country as a whole. I
If things were that clear & simple, you would see much more attacks on the strat targets.
However, it's is only this way in theory. Practically, it's not worth the effort. If you thinking in strategic "war" terms, attacking the strats is, for all means and purposes, "wasting resources". It needs a huge effort to reduce the strats to a level so low that there is any potentially notable effect on the enemy. You have to kill the city (huge target!) before taking down the factories, or they will be popping up again before you even get home.
So you have to kill the city, then the factory, then pork the enemy bases at the frontline. Now take into consideration how far the strats are usually away, the puffy ack and defenders who don't have to guess where you are going to. Now if you add up everything, you will end with a considerable number of manhours having to be invested. The same effort invested into tactical attacks has a much bigger impact, it's simply far more efficient.
In most cases two to four guys would have to work for hours to impact the strats enough to make a difference (and even then enemy fields still need to be porked to take advantage of it) - but the same number of players could
easily keep a whole front (or two even) completely porked all the time without doing all that long range bombing stuff.
It's a lack of balance. I could try to fight my way to the strats in heavy for almost nil effect, or I could very effectively pork half a dozen fields in the same time in heavy fighters. I have tested both options. The result is clear.
So in the end, if you are playing for score points, you will drop random town centers. If your focus is to help your team, you will bomb towns & hangars to make them ready for capture or you will pork fields. Yes, you could always bomb strats for fun only, but most players try to combine fun with a "purpose".