Flash Player no longer usable?

I am finding it difficult to understand *why* it was necessary to no longer allow anyone (read:  not commercial use) use Flash Player anymore.

Now, I realize that the answer to this might be obtained, after wading through an overly technical and overly legal description about... hmm... not sure.

The problem is that I have read the document about "end of life" for this product many times, however it does not address the reason directly.  Certainly not with any specifics--explained to a native English speaker.  Even more, it's unclear to me and this is after working in the software industry in Silicon Valley for decades.

Therefore, I would appreciate an answer that directly addresses why the end of life had to occur.  And why would someone who had installed it prior to the end of support date, would still not be able to use it.  Never, ever having the need to discuss anything with "support" during the long time it had been used previously.

Because intruding into the personal computers and "at home use" by creating a "death" of its ability to be used under any circumstances is seemingly stupid.  And to be honest, it makes Adobe Inc., come off as a bit arrogant and overly confident in it's position within the market overall.  It's not a wise place to put one's company in, obviously.

There will always be another generation of young engineers graduating from colleges across the country looking for an opportunity such as the one this creates.  (Writing a software workaround or creating a program that allows the use of all that used to be this "dead" product of yours...  And perhaps many of the other programs that Adobe licenses currently.)  Right?

Everyone is always looking for something better.  Why in the world would Adobe, an otherwise successful company, want to create such marketplace?

Regardless, please reply with a clear reason that Adobe needed to effectively kill the Flash Player product for individual users in the comfort of their own homes.  Who had never and would never need support of any kind.

Thank you