Y'see Primal, I do give a shit about this stuff. I think it's really important, that we are all connected and to have a healthy society we all need to work at it a bit.
Oh dear, Boffin, you probably lived in my old community. The type of person who jumps to the window every time they hear a siren to check what's going on, or is the the first to notice Mrs Jones down the road hasn't moved her car for a week. All in the interest of the community of course.
The truth is, weddings are about the two people getting blissfully legally contracted - most people outside their main family/frienship group really don't give more of a fig than a "well done, is it a free bar?". Yes it was different in the days of small communities and church goers, but this isn't always 'the norm' these days. A wedding can be as big or small as the couple getting married chooses, they can exclude everyone if they please and say their vows alone. The 'after bit' is just a party, and in any other circumstance adults wouldn't really expect kids to be at a party that goes on late into the night with booze in easy access. So, why are wedding parties any different? Kids really really don't care about the ceremony bit (boring, lovey dovey stuff that can go on for an age, or being so young you have no vocal control and shout/cry over the whole thing), and the after bit can be an over-excitement, over tiredness, boredom. Even the most well behaved child would get fed up eventually - it's not a kids party after all, and they should not be especially provided for, that's your job as their parent. If it's too out of your way or a faff to deal with, don't go with grace. Not throw a strop your little darlings won't get to be part of the stress of getting there and back.
That's the issue in society, some people thing that their life choices are ones to be celebrated throughout the wider community, but no one cares you're getting married, or had a baby beyond general politeness. Anyone who thinks it is a time for the world to stop and celebrate these types of things really need to get over themselves.