Most users think the way to install a program is to click next-next-next untill the program is installed. Since they downloaded Filezilla, they will expect that

Most users think the way to install a program is to click next-next-next untill the program is installed. Since they downloaded Filezilla, they will expect that program to install, and not other crap. Are they to blame for not reading? Maybe. But nobody actually wants crapware in their machines, so bundling it with your software so that stupid users get it installed is not nice.