yes it is. buying companies' patents for the sole purpose of suing another company is called a patent troll.No it’s not.
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I'd imagine a company can still be a patent troll and still sell products. example: I'm Apple. I see a company is failing and willing to sell their company. I can buy all of that companies patents and sue another company for infringing on my newly acquired patents. This is also a patent troll, but when Apple does it it's ok and people here defend that.
yes, that example is a patent troll, but I don't recall Apple suing others for patents they never used. can you think of one patent where Apple has done this?