Someone has posted the idea that all Protestant sects think they are better than other Protestant sects, and certanly superior to Catholicism.
I take issue with that. Most mainline Protestants - Methodists, Presbyterians, most Lutherans, Episcopalians, Congregationalists, certain Baptist groups, etc. - have cooperated together for decades through the World Council, National Council and local clergy groups. Their members often change affiliation when they move and find a church they like with a different label. Methodists easily become Presbyterians, etc. You often do find a dogmatism among avid fundamentalist Protestants - among some (not all) Southern Baptists, for example.
As for becoming Catholic, most Protestants are comfortable where they are and will not change except perhaps join a different Protestant church when they move, maybe are dissatisfied with a new minister, etc. They choose a church - as when they move - not so much because of theology or even liturgy, but such factors as location, atmosphere, friendliness, education, Sunday School facilities, overall program, music, sermons, ministerial personality, outreach by local church, and even parking! Theology doesn't play a central role anymore among the large majority of mainline Protestants. While a Methodist may first visit a Methodist church in a new community, if they find a Presbyterian church more to their liking for whatever reason, they might decide to go there. That style of ecumenism is very widespread and has been around a long time.
Mainline Protestants will seldom become Catholic because so many of them are 'freethinkers' and value that intellectual freedom. Conservative Protestants are more likely to be theologically committed, though the center of their theology is 'being saved' or 'born again' and few are interested in a wide range of complex doctrines. Conservatives also are more likely to be alienated by formality in worship - vestments, incense, "prayers-book" religion, and other liturgical practices. They enjoy spontaneity, spirited worship that varies some from week to week.
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