There's bound to have been missed connections at Stansted - very possibly involving onward Ryanair flights - as well as missed appointments
Ryanair make it clear they do not operate a 'connecting service' airline. They provide one which operates point to point. If you're depending on Ryanair to get you to a connection, you'd be better off considering using another carrier which operates flight connections, otherwise you just have to accept the risk you won't catch your onward flight.