Against lesser evil voting;
While lesser party voting can often appear appealing, it could be damaging in the long run. Imagine a team of fashion designers tasked with choosing between two designs: one that is jarringly different from current trends but has a chance of being the next big thing, or a design that consumers are more familiar with. In the end, the team votes and decides the more conservative choice which, as they expected, ends up being profitable. With this moderate success in mind, the designers continue to make conservative choices because they know that the designs will sell and, as a result, prevents the fashion industry from changing and innovating. Overtime, this choice ends up stifling creativity within the industry. Likewise, lesser evil voting, or simply choosing to vote for a different candidate because you don't believe your preferred candidate has a chance of winning, could end up making the country appear much more moderate than it really is, and, much like the conservative designing, could stifle change in the long run.
For lesser evil voting;
Imagine you are trying to do your laundry because you need to wear nice clothing for an event tomorrow. You hang a number of your nice knit sweaters hanging outside to dry because they would drip on the ground inside your house and they can't be put in the dryer because they will shrink. Suddenly, you check the weather and see that it will start to rain. Both choices that you have are unfavorable: you could take the riskier choice and hope the weather forecast is wrong, or bring the clothing inside and risk having to clean up a big mess. You decide to take the riskier choice and leave your clothing outside. The rain comes, and you are steps behind where you would have been if you'd taken the time to bring your clothing inside and clean it. Thus, much like the laundry analogy, in voting, sometimes disregarding lesser evil voting and choosing to vote for your preferred candidate can backfire and bring the country steps back from where it could've been.