Re: Don't worry, it's only money
Imposing penalties on the UK makes sense ... idea is to discourage other states from leaving when they see how nasty the outcome is. Perfectly logical long term tactics, a bit of short term financial hit for the EU is worthwhile in the long game.
Given the rabid anti EU content of a lot of the UK media over the years ("Up yours Delors" etc.) and abuse from lots of UK politicians who (bar the odd ultra virtuous paragon of moral perfection) could blame some EU bods for twisting the knife when the opportunity arises as most of us are fallible grudge bearing humans despite our efforts to rise above petty revenge.