I am happy to enlighten you though I am only a liberal republican.
For isn't every man free in every system?
No. Every man is not free in every system. Not even close.
Isn't the amount of thing which are punished by law the only difference between the political systems?
No again. There are far more differences. There are differences in the amount of self-determination for example. In America one might aspire to political power. In Saudi Arabia not in the current system where all power is held by the monarchy. There are differences in what one might expect to receive in personal aid from the state. In Great Britian one can expect health care. In the US not.
If so, then it means that liberals are fighting for less repression from the state.
Well it is not so but I think most liberals fight repression by the state. But then I also think true conservatives (at least in the US) do too.
Why? Well, I dunno. Maybe because they are not content with the basic law of nature that strong rule over the weak?
Perhaps because there is no such law. Piranha school for protection. Alone they are timid fish but in a large school they have formidable defenses. Cattle alone are prey to many animals but in a herd with a few bulls they are very strong indeed. The are weak individually but strong in groups. So if people can learn one thing from nature it is not that lions have big teeth; it is that a few hundred cattle could care less as long as they stick together.
Maybe because they don't have guts to go for power themselves so they want to take the power from those who have it?
Do you think the above makes any sense? It doesn't. Do you consider the ACLU liberal? I do. It takes on the powerful all of the time. It is true that liberals like George Washington, John Adams and Thomas Jefferson did want to take power away from the powerful. And they did. But not by being weak. These liberals gained power by kicking the ass of the most powerful nation in the world. And at great personal risk I might say.
Maybe because they don't realize that there are many systems which are far more effective then liberal ones?
What is a "liberal system"? More effective at what? Let's see. One of the countries with the most individual rights, freedom speech, freedom of religion, plurality of belief, freedom from official bigotry and freedom to change classes; in other words one of the countries which has more than average liberal ideas, is also the most powerful and wealthy nation in the world. And not just by a little bit. I am speaking of the US. Tell me which system is more effective than that of the US or Great Britian. Both liberal democracies.
I don't know you but I think you should reconsider what liberalism is. Don't rely on Hannity or Limbaugh. Neither would know a liberal if it bit him in the ass. Liberals are some of the most powerful people the world has ever known. I mentioned three already. I could also mention Ghandi or Roosevelt and many many more.
So you see my friend your questions are incorrectly directed. Liberals are not people who are out to get the few who have power. Liberals are people who believe that we all should have equal power. And they understand that by joining a large group of empowered people they can become far more powerful than the isolated despot. And to make their Army of friends more powerful they are smart enough to be very careful about who they exclude. Finally liberals understand the basic truth that just because lots of people get pie doesn't mean that you don't. Liberals believe that the fruits of freedom belong to everyone. Not just the rich or the momentarily powerful.
Liberals are not weak they are smart.