Considering all the things (none come to mind, sorry) we formerly thought we shouldn't do (because of false beliefs) that turned out to be beneficial in the end, I'd say we should go with the experiments.
The good news is that, if we find that it's possible for a civilization like ours to build a machine that can destroy the universe, we'll finally shed some light on that pesky Fermi Paradox.<p>Perhaps I should print up some T-shirts for the occasion: "Humanity: We're Number One!"