Both guests and bride and grooms seem to have greater capacity to be offended about weddings than lots of other things.
Brides and groom are totally free to invite who they wish to their weddings - they have to recognise the consequences of inviting everyone or having a restricted list. Sometimes Brides and Grooms seem to think that being the Bride and groom means they can BOTH invite who they wish AND expect everyone to attend and do everything they wish. In reality they can't have both,mbut some don't seem to realise this.
So, don't invite children - fine - gives them the advantage of saving money, being able to use smaller venue, invite more friends etc - but possible consequence is that some people can't come due to lack of childcare. Bride and groom need to understand and accept this as a possible consequence of their choice.
Invite children - fine - means people shouldn't have the childcare issues, but might mean bigger bill or less room for friends etc.
In the end, isn't all of this about accepting and understanding none of us can have everything and that the world doesnt revolve around us. Brides and grooms can think that being these getting married means everything can revolve around them, but it can't - people might have to decline due to kids not being invited or distance or costs involved - all valid. Guests have to accept that it is someone else's wedding and they get to choose Who is invited - the guests however get to choose if to accept.
I've had weddings I've been invited to and had to decline. I've been sad not to see that family memeber or friend married - but I've been glad to have been invited and only declined because of circumstances. Likewise,now hen I got married, I had to choose who to invite and not and had people decline for practical reasons, some of which related to choices I'd made - I was sad they weren't there, but understood why they couldn't be.
Guests and bridal couples - it's not all about you!