How is deliberately lying about your incentives and hiding your source of funding under oath testifying to Congress even remotely ok? How are you rationalizing

How is deliberately lying about your incentives and hiding your source of funding under oath testifying to Congress even remotely ok? How are you rationalizing this? What kind of message does it send if we let people lie under oath about what could potentially be so catastrophic? What if they did the same thing about nukes, what's the difference right?