1. SegWit was designed to fix the issue of transaction malleability, which is a vulnerability in the Bitcoin protocol that allowed attackers to manipulate transaction IDs, making it difficult for users to determine the validity of a transaction. By separating the transaction signature from the transaction itself, SegWit makes it much harder for attackers to manipulate transaction IDs, thus mitigating the risk of fraudulent transactions.

2. Some critics argue that SegWit has introduced other issues that compromise the security and scalability of the Bitcoin network. For example, SegWit allows for the creation of complex transaction structures, such as the Lightning Network, which could potentially create single points of failure and increase the risk of denial-of-service attacks. Additionally, some critics believe that SegWit has made it more difficult to implement certain security features, such as transaction replacement, which could make the network more vulnerable to attacks. Finally, BSV proponents argue that SegWit has compromised the original vision of Bitcoin as a peer-to-peer electronic cash system by implementing features that prioritize scalability over security and decentralization.