Amongst many issues, three things stand out. Firstly, as I understand it, there is "pressure" in Ryanair, and it affects their whole operation: pressure on airports (50p a pax etc), pressure on ground staff, pressure on flight crew, and especially pilots. This is the sort of "commercial pressure" always frowned non in the past. It was labelled a "bad thing". (In fact I accept that an element of commercial pressure brings the best out of us all, but there is a limit.)
Secondly, there is a view, probably held by the accountants running so many companies, that flying a go-around is another bad thing. Absolute rubbish, of course, as going around when one hasn't got things quite right, is a sound and sensible and honourable thing to do, and really the pilot should be congratulated on the decision, not scorned.
Thirdly, the FO probably didn't abandon the aircraft because it was his leg going home, and he knew he'd do a better job of it than the Captain. I can't blame the FO for continuing, and if the flap speed was exceeded by 10 kts, well, I've seen a lot worse. Not good enough, I agree, but taking everything into account (and not worrying about my job) I think I'd have flown back with the aircraft and that captain. At the same time, if the FO had refused to fly back with that Captain, he'd have been in the right.