Are you kidding? There's no such thing as "price suppressing bots". To lower the price you have to sell coins, to raise the price you have to spend BTC and buy coins. There is no other way except doing this or tricking others into it. Bots can automate selling/buying large amounts without moving the price much so you don't have to sit there and place an order every 10 minutes. Also they can make the chart look like it's all red/green. Look at DASH on Polo - a good example. It can fool only the most inexperienced traders, like the ones being attracted here by constant "this coin moon tommoro buy cheap coins buy buy buy" buzz.

The only reason for the downtrend is lack of interest and absense of outright manipulation.