Or _for_ something. All electoral systems have flaws, all the ones that would be practical for this purpose (election of individual candidate representatives from a list by the general population) are subject to tactical voting of some sort.
In this case - FPTP - the tactics are to identify the (usually two) candidates that most plausibly could win in your district and pick from those, ignoring all other candidates. If Apples win with 310 votes and Bears had 290 votes, those Apple-haters who gave Cheese 60 votes to come in a distant third are kicking themselves.
For many (millions of?) voters in the UK the idea is to achieve a specific outcome on a single issue (Brexit) which is not actually on the ballot at all, so tactics come into deciding how to vote so as to make your preferred outcome more likely to occur.
