I can't actually think of a reason why becoming a father would make him shy away from conventions. It really isn't terribly relevant. However, the more fanatical element of fandom is actually larger than you might think.....consider this - the word 'fan' is derived from the word 'fanatic'. So in reality a group of fans are people who are fanatical about the object of their interest, whatever, whoever that might be. I can't actually think of why anyone would want to stalk RDA, except that there are people out there.....in his case probably female.....who cannot control their interest and keep it to an admiration, and who are pushed beyond the normal limits to get the attention of their object of desire. They tend to become stalkers.
People like this generally see themselves as the one person in the world that their desired object wants to see or be with, to the extent that it pushes out all normal life and/or relationships. They actually feel that the actor/actress/whoever personally knows them, what they are thinking, what they are feeling and what they want. And they are also convinced that they know what their object desire is thinking, or wants. So when they actually go out of their way to meet their desire, they are often insulted and angered when this object of desire rejects them. That's when things get nasty. I imagine an actor/actress put in that situation would feel totally bewildered and who could blame them?
In my short time in online fandom, I have encountered many who teeter on the brink between admirer and diehard fanatic. In fact I'd say that a good half of online fandom walk a very thin line. You have only to read the constant postings of people who will continually say that they have met this actor and that actor. They'll often infer that they know these people well and have had many conversations with them. They will usually drop casual references into conversations with other fans, hinting that they are in the know about personal matters.
I know many fans have met some of the actors from shows at cons.....some people may have had the good fortune to hold lengthy conversations, but I think they may be few and far between. Mostly what people get is a five minute conversation whilst in an autograph queue, or perhaps a few more minutes at a cocktail party.
I could say I met Tony Amendola - for all of five minutes outside a hotel in Heathrow. He gave me a kiss and cuddle and remembered me the next day in the autograph line - but I don't KNOW him. I met Anthony Hopkins while working in Beverly Hills and we had a conversation which lasted over an hour, but I doubt if he would remember who I was now and I don't profess to KNOW him. On the other hand, when I was doing Session singing in recording studios a few years ago, I did do some all night sessions with Stevie Wonder who was doing some producing on the tracks. There were a few of us there, but the situation and length of time it took us to lay backing tracks (three days) meant that we did actually sort of get to know him. I still wouldn't say I knew him personally.
Online fandom, indeed any kind of fandom is a scary place and if you were the perceived object of desire, and already had a taste of some fanatical female stalking your every move and demanding your attention as though there was a personal relationship going, wouldn't you hesitate to put your head in the lion's mouth? Damn sure I would.