Twitter is designed to encourage interactions at all costs, especially thoughtlessly provocative interactions. People see something that outrages them incredibly easily (thanks to full text search, algos, trends etc), they reply instantly and the merry cycle begins again.
Mastodon puts a bit more friction in the system (hashtag search, no algo, no trends), and hopefully so encourages more thoughtful actions. It's less convenient to find stuff, but that's the point?