I don't think anyone here thinks you've become an "activist." You had misgivings, or you wouldn't have been here on this DB in the first place. When you found out the half-truths and manipulations in the teachings you had accepted, you're natural (and normal) impulse is to want to talk it over with the ones you love. In a normal situation, that is what our loved ones should be there for-- to help us process these kinds of shocks to our system.
But they can't look at it that way.
When I was first becoming absent from the meetings, I still believed it was the "truth," but I had vague misgivings, and hurt feelings, not to mention that feeling in the pit of my stomach that things weren't quite right. My younger brother, who is quite devout, called me one day to "help" me. He wanted to know if I still considered myself a JW, and if I still accepted the direction of the F&DS. (At the time I didn't know it, but these are two of the questions elders are taught to ask to find out if a person should be da'd.) As I said, at the time, I still believed JWs had the only "truth," and I answered in the affirmative.
He then went on to tell me that people have doubts, but that the only way to deal with them is like a garden, you must get in there and rip out the weeds when they are still tiny. They cannot be allowed to grow by letting them remain for any length of time. Just rip them out as fast as they pop up. I believe this is exactly what they are doing. You remember the illustrations in the literature about action when presented with other written materials that conflict with JW beliefs? They are not even to look at them-- not even the cover. They have an automatic tune out mechanism, that is cultivated by all the repetition and simplicity. Anything that conflicts with their beliefs is instantly to be dismissed, before they have even a chance to examine it, much less critically.
It's painful for family members who have awakened critical thinking to see their loved ones stuck in this mode of being completely blinkered. From their perspective, it's painful to see you being "deceived" by Satan. But they are also fearful that you will now be a tool Satan will use against them due to their love for you.
I know it hurts. Most of us have been there, many of us still are.