I guess that depends on the values you hold, doesn't it? For many of us, there are some values that occasionally trump that of unrestricted competition, and many of us believe that sometimes free competition reduces freedom rather than increases it.
Or even more accurately, many of us think that it is possible to conceive of things worse than rent-seeking, and so in some circumstances it is possible that a reasonable amount of it may be the lesser of two evils (just as accepting killing in self defense is not the same as "supporting murder"). Others, of course, may believe that there can be nothing worse.