The purposes of those concepts are totally different.
The purpose of trademarks is customer safety. If it wasn't illegal to infringe trademarks, it would be much easier to distribute fake products, and companies would have less incentive to build their brand on quality.
The motivation for copyright is similar in that it exists to incentivize beneficial behavior (creating valuable works). But it's different because it also limits the distribution of the works. If this "cost" is too high, there is no economical sense in having so long copyright.
Trademarks are not intrinsically valuable (to society). Limiting their use has no cost.
The purpose of trademarks is customer safety. If it wasn't illegal to infringe trademarks, it would be much easier to distribute fake products, and companies would have less incentive to build their brand on quality.
The motivation for copyright is similar in that it exists to incentivize beneficial behavior (creating valuable works). But it's different because it also limits the distribution of the works. If this "cost" is too high, there is no economical sense in having so long copyright.
Trademarks are not intrinsically valuable (to society). Limiting their use has no cost.