Because getting a J4, Wukong, Ahri, Eve, Kalista, etc in bot lane that just feeds is ridiculous.
The crazy part is I'm queue up for Support first and Jungle second and I keep getting jungle. Like Riot wtf I actually don't mind supporting. Every time I queue up for support fill I get ADC and I select pure fill I get mid/top most of the time. At this point I'm convinced match making is trolling.