People who do this shit don't plan on getting caught, so "tougher laws" likely wouldn't be much of a deterrent. Besides, even with the current laws, convictions and the sentences are often mild, and the bad guys are let out of jail way too soon.
MPs would be easy targets, and could potentially have a decent chunk of cash on hand but I doubt much remains on site at close of business, or if it does, it's in a legit safe.