No, voting shouldn't be mandatory, allow me to give you a rational thinking explanation: You didn't ask to vote that certain thing, Yet you were forced to, the vote that was on that thing is technically false, wouldn't that make you mad, the fact that you were forced to do something you didn't ask for.. which is why I ensure you, you must have personal freedom to vote somebody or not, false votes are morally bad, and only causes more harm to the entity which was voted because people will know it's false, in this world there's good and bad, false is bad, true is good, so saying something that is false already gives bad thoughts, and bad thoughts are things that tend to be avoided, because of course, they're bad.