I have the impression that every-time bitcoin starts climbing steadily, the XRP pumps like crazy 100%+ within 24h, causing doubt in the entire market!
Are altcoins like stellar and xrp harming the bitcoin price by their manipulated pumps ?
Do you have any actual data to support your claim? Is this like a mere opinion without any factual basis?
Again, the prices of altcoins against bitcoin are independent of each other. Though there may be cases where both increase/decrease at the same time, one cannot fully justify that the reason for the change on their price is due to the other.
In order to understand the market of bitcoin, check the latest news on cryptocurrencies. There are lots of factors that need to be considered on their price increases/decreases.