Large(r) parties generally cannot demonize (all) smaller parties all the time. Once you get to the election, you need somebody to go into a coalition with you s

Large(r) parties generally cannot demonize (all) smaller parties all the time. Once you get to the election, you need somebody to go into a coalition with you so you get over 50% of the votes. Obviously this applies only if your party has less than 50% of the votes, but in multi-party democracies its more unusual for one party to have 50% (or more) of the votes.