Because that attitude is suffocating good content from taking place. Good content suffocates under the necessity to bring ever more numbers and ever more supers and titans. If people really wanted to fight, they would not join a group that has over 34000 characters and is more than twice as big as the next biggest alliance and who is allied with 3 out of the other 9 alliances in the top 10 by numbers; they would join the fight against that group and farm them instead.
The coming half-measure changes will not help those corps at all if they use a structure in their corp or an alt corp. Why shouldn’t war dec corps not “decide” how you use EVE? In null sec and low sec, the bigger, better prepared sharks decide how you use EVE with far more serious threats to your usage experience. What’s the problem with that taking place in high sec? I have been subjected to this a couple of times and found solutions. I have seen other corps around me being subjected to this and find solutions to this as well. The problem are people and corps who do not want to find solutions for a problem.
What do you really expect? They started EVE and without any preparation and knowledge or guidance, they immediately want to enter the endgame in a hobby that centers all activities around destroying things and ruining someone else’s day. If you voluntarily jump into that shark tank although you don’t know a thing about it, you deserve to get crushed. The stepping stones are already there, as described multiple times (EUni, cooperation from within NPC corps, alts, learn EVE as part of a bigger group, look for guidance and assistance that’s available plentifully, etc.)
Furthermore, people should also learn to deal with failure. It will befall you many, many times in EVE because EVE is, as said, centered around destruction of your things. That is the whole point of EVE and it is being employed to ridiculous extend outside of high sec. In high sec you at least have the opportunities to avoid most of that, namely wars, by not immediately forming a user-created corporation and instead use all the other means of cooperation that are available to you.